“What is MTHFR?”

When people ask, ‘What is MTHFR?’, do they mean what is the MTHFR gene or do they mean what is the MTHFR enzyme?

In this article, I am going to provide you the basics of the MTHFR gene.

  • What does MTHFR stand for?
  • Is MTHFR a gene or an enzyme?
  • What other terms are used for MTHFR?
  • Where is the MTHFR gene found?
  • How big is the MTHFR gene?
  • What is the function of the MTHFR gene?
  • Why is the MTHFR gene important?
  • How much of the MTHFR gene gets mutated?
  • Common mutations of the MTHFR gene

What does MTHFR stand for?

MTHFR stands for the methylenetetrahydrofolate reductase gene (methyl-ene-tetra-hydro-folate-reductase).

Is MTHFR a gene or an enzyme?

For some reason, scientists thought they should name the gene MTHFR and also name the enzyme MTHFR. This is confusing and causes confusion especially if MTHFR is not labeled as MTHFR gene or MTHFR enzyme. Think of it this way: a healthy non-mutated MTHFR gene is supposed to produce plenty highly functioning MTHFR enzyme.

What other terms are used for MTHFR?

NADPH is 5,10-methylenetetrahydrofolate reductase. The MTHFR enzyme, made by the MTHFR gene, convertsย 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate.

Where is the MTHFR gene found?

The MTHFR gene is found on the short arms of Chromosome 1. There are two short arms of chromosome 1. Why? Because one short arm of chromosome 1 comes from the mother and the second copy comes from the father.

How big is the MTHFR gene?

The MTHFR gene is made up of 20,373 base pairs. A base pair contains two DNA nucleotides. A DNA nucleotide is made up of pyrimidines. The MTHFR enzyme actually helps produce pyrimidines – but that is getting ahead of ourselves.

What is function of the MTHFR gene?

The function of the MTHFR gene is simply to produce the MTHFR enzyme. However, if the MTHFR gene is mutated, the enzyme produced is not entirely correct.

Why is the MTHFR gene important?

The MTHFR gene is responsible for making a functional MTHFR enzyme. If the MTHFR gene is slightly altered (mutated), the MTHFR enzyme’s shape becomes distorted. Enzyme function depends a lot on shape. It is similar to the grooves on a key. If the grooves on a key are slightly different than the lock, the key may fit and turn the lock a little but it does not unlock the door.

The genetic code of the MTHFR enzyme must be perfect in order for it to function properly. A dysfunctional MTHFR enzyme may lead to a slew of health problems.

How much of the MTHFR gene gets mutated?

In heterozygous MTHFR mutations, only 0.000098% of the MTHFR gene is mutated. In homozygous MTHFR mutations, the value is basically the same.

This means there is just 1 mistake for a heterozygous MTHFR gene mutation out of 20,373 steps done properly.

There are 20,373 base pairs making up the MTHFR gene on each chromosome. Remember one chromosome comes from the father and one comes from the mother.

What are the most common MTHFR gene mutations?

The most common MTHFR gene mutations are found at position 677 and/or position 1298 on the MTHFR gene.
At position 677 of the MTHFR gene, a Cytosine is what is supposed to be found there. When mutated, the Cytosine gets replaced with a Thymine.

At position 1298 of the MTHFR gene, an Adenine is what is supposed to be found there. When mutated, the Adenine gets replaced with a Cytosine.[1]

Researchers present MTHFR mutations most commonly like this:

  • MTHFR 677CC = a normal MTHFR gene
  • MTHFR 677CT = a heterozygous mutation which is one mutation
  • MTHFR 677TT = a homozygous mutation which is two mutations
  • MTHFR 1298AA = a normal MTHFR gene
  • MTHFR 1298AC = a heterozygous mutation which is one mutation
  • MTHFR 1298CC = a homozygous mutation which is two mutations
  • MTHFR 677CT + MTHFR 1298AC = a compound heterozygous mutation which is one mutation from two different parts of the gene

Long Term Solution for your MTHFR Mutation

Now that you realize what MTHFR is and how it may be actually causing you issues, I’d really like to see you get on a full program.

Reading my book, Dirty Genes, will help you immensely.

You’ll learn about MTHFR and how to use methylfolate in depth, yes, but you’ll learn WAY more than that.

Empower yourself and take action the right way.

Dirty Genes is the guide you’ve been looking for.

It continues to be a bestseller month after month for good reason.

Dirty Genes book by Dr. Ben Lynch

You’ll see why once you pick it up and start reading ๐Ÿ˜‰

Don’t like reading books? Want to get more in depth and see how it all ties together?
Get access to the Dirty Genes Course where I discuss how food, lifestyle, environment, mindset and genetics are influencing how you’re feeling – and how to deal with it all.

The Dirty Genes Course is where I bring in a lot of published research, translate it and make it actionable for you. It’s an extension of the book, Dirty Genes. There is a lot of science, biochemistry and actual examples of how to use this stuff in your daily life.

Is it going to be over your head in terms of difficulty?

Absolutely not.

You’ll learn a ton and you’ll be amazed how easy it is to implement what you learn.
Any comments or questions relating to what the MTHFR gene is, please post a comment below.


  • Anuj S. says:

    I am heterozygous CT genotype. What does this mean?
    My doctor wants me to take Deplin 15 and methylcobalamin subcutaneous injections.
    I am dealing with neuropathy, insomnia, fatigue and depression.

  • Shannon says:

    I am having trouble understanding what, exactly, the mutations are. I have AA at C677T, and TT at A1298C.

    In a user thread on 23andme, C677T/AA is flagged as being troublesome; A1298C/TT is not.

    “The Name Game” from the page at says that there are two variations at position 677, C and T (hence C677T). Likewise at 1298, A and C. So how do I have As at 677 and Ts at 1298? And why is only one of those a problem?

    Help! I am so confused…

    • Shannon says:


      While 23andme gives AA for C677T, as does Yasko, Promethease gives TT
      While 23andme gives TT for A1298C, as does Yasko, Promethease gives AA

      All three flag that 677 as a problem. All three call the 1298 result good.

      All three are looking at the same raw data.

      Does Promethease invert the call (A->T, C->G, etc) to give their result? Which result should I give a physician if asked about it?

    • mark says:

      I have exactly the same alleles at C677T and A1298C and have been confused by exactly the same thing!

      Must be a simple explanation… anyone?

      • Cathy says:

        Simple explanation: Bases in DNA are paired. So A pairs with T and C pairs with G.

        The result you are getting may be due to which strand of the DNA was sequenced through the 677 and 1298 sites in your test. The forwards strand would have C (or T if you have the mutation) while the reverse strand should have G (or A if you have the mutation.

  • Patti says:

    Dear Dr. Stein,

    I was recently tested and have the A1298C Homozygous mutation. My sister has the compound mutation. My son has the compound mutation. How would I have two copies of the mutated gene and my sister only have one of the 1298 mutation? Could my test be wrong since my son has both as well?

    • Pamela Sage says:

      Neither mutation is that rare. Barring spontaneous mutations, both of your parents would carry the 1298 mutation, but one or both would have been heterozygous for the 1298 mutation. One or both of your parents would also have been heterozygous for the C677. You inherited the mutated 1298 from both parents. Your sister inherited a mutated 1298 from one parent, while inheriting the normal copy from the other parent. If I understand you correctly, you do not have a C677 mutation. If both of your parents were heterozygous at C677, you and your sister each had a 50% chance of inheriting the mutated form or only 25% if only one parent carried one mutated C677. If you can remember your Mendelian genetics from grade school, you can calculate the probabilities for different outcomes. The cards of the deck are reshuffled for each child. Now you say you received mutated 1298 from each parent but no C677 mutation. You definitely passed on a mutated 1298 to your son. For your son to be compound, he then received a mutated C677 from his father. As I said, sizable minorities of the population carry one of the other of the mutations and are blissfully unaware of it. Normal copies mask most of the ill effects except for those who are homozygous for one of the mutations or get the compound mutation, which greatly inhibits methylation.

  • Mike says:

    I’m confused my 23andMe report says I have the following:

    MTHFR C677T rs1801133 A AA +/+

    The “+/+” is in red. I couldn’t match this to your table above. How many mutations am I?

  • Mike says:

    Here’s more information:
    dbSNP Orientation: Minus
    dbSNP Genotype: TT
    Also, would there be any benefit to getting the following additional test from Quest Diagnostics?
    Methylenetetrahydrofolate Reductase (MTHFR), DNA Mutation Analysis: Quest Test Code: 17911
    Or, do I have everything I need from my 23andMe test?

  • Terry says:

    Dr. Ben:
    Just a simple (and maybe not so simple to answer) question:
    What kinds of physical problems does this mutation cause?
    I have a friend who is being tested for this because she suffers from much fatigue, which could be related to thyroid or adrenal issues. Could you elaborate a bit on what impact this mutation has on the body? Thanks!

  • Julia says:

    Hello, and thank you for making yourself available to answer questions.

    1. My tests have thrown me a curve ball. They came back as homozygous for C677T and Heterozygous for A1289C.

    My doctor hasn’t seen this before, and none of the information I can find mentions it either. Is it as rare as it seems? As far as getting educated and for advice, should I just be looking at information on compound MTHFR mutation?

    2. We have just about every condition that could be associated with MTHFR mutation in my family, but I only recently heard about it and I am the first one to have been tested. Am I correct to understand that both of my parents must have the 6776 mutation, and at least one the 1289? So should my Aunts and Uncles should also be going for testing as well as their kids?

  • Sarah says:

    Julia, from what I understand 44% of the population has hetro C677T and 12% has A1289. I have C677T from my mom and A1289 from my dad…that makes me compound Hetero…I am not sure how many people have homo C677T, but if 44% of the population has at least one copy of it, you would think that it is more common than one would think…but to be homo C677T and hetero A1289C … that is interesting … do you have clotting issues, fertility issues … I know you said your family has almost all of the symptoms … I only ask because I have fertility issues and that is how I found out … have they checked you for clotting disorders … that seems to be the most dangerous one that comes to my mind … I am sure one of the admins can make heads or tails of this and also tell me if my info is correct. I haven’t received feedback on this forum from an admin…I am going back into fertility treatment so any info about any of your questions, mine or anyone else’s would be great…hint hint…don’t panic … read this site and add methylfolate and methyl B12 and watch out for pain associated with opening your methyl pathways…if that happens then take niacin…I didn’t know that when I did it…good luck ๐Ÿ™‚

    • Julia says:

      Hi Sarah, thank you for taking the time to reply.
      Due to having been sick with ‘fibromyalgia’ most of my life, and seeing that my relatives were all sick I felt that my kids chances of being healthy were slim to none, so haven’t tried to have children. I have always had problems with my menstrual cycle and hormonally fit the profile of PCOS although ultrasounds have only shown a couple of minor cysts.

      Fertility was an issue for my mum, the doctors told her that it was a miracle she ever carried a child, and that she had four of us was astounding. She had to have a hysterectomy in her early 30’s due to hemorrhaging causing constant anemia. Mum has problems with clots and has thrombophlebitis, vein inflammation. My sister also has problems with clots, she’s currently dealing with some in her lungs. My doctor want’s me to have scans done to check my lungs and brain for issues due to shortness of breath and neurological symptoms, so I guess that should get covered. A test for von-willebrands has been ordered, but I’m not sure that is the right sort of blood test.

    • Heather says:

      Hi Sarah & Julia,
      I’ve been looking for answers for a long time. I am compound hetero as well. I don’t know which copy came from which parent.
      I’m worried about my son who has not been tested. He has shaky hands all the time. That scares me and no one knows why.
      I’ve had problems with clots – had to had veins stripped out of my leg. Was told I have PCOS. I have shortness of breath. Had cervical cancer. Suffer with anxiety along with depression. I am in pain all the time, muscle pain, headaches ALL the name a few. Sister had an ablation because was causing anemia & she had fertility issues as well. Father passed of brain cancer.
      What are you taking exactly and how has it helped?

    • Heather says:

      I don’t think anyone AKA – admin… Reply to anyone on here. I think he just try to sells his vitamins or something.

      Also wanted to tell you.. My sister did have fertility issues. Took her awhile to have her first child without any help from the doctors, she did want more children and wasn’t happening so she did do fertility and she got pregnant with twin girls. She has 3 healthy kiddos!

      I have one child but that’s all I tried for and I wasn’t trying ( if you know what I mean )

      I’ve read a lot about PCOS and with it is fertility issues. My doctor treats PCOS and his office is filled with pictures of babies who when prescribed Metformin – for some reason, ( I’m no doctor ) they get pregnant.

      Just thought I would mention this.

  • Annmari Cooper says:

    I have just received some blood work back, as my PCP is trying to figure out why I am so sick and having daily terrible headaches among other things. The lab results came back saying” Two mutations (C677Tand A1298C) identified. I have not yet been contacted back from my doctor as to what that means if anything for me. I was just researching on my own to see if I could figure anything out, however, I am just now more confused.


  • Katherine says:

    I did the 23andMe testing and have AG for C677T and GT for A1298C. I believe this means I have the mutation, although I am still unclear about most of this. Can you describe in layman terms what this means for me? Many thanks.

  • Karen says:

    Hi I was just told I have the MTHFR ( A1298C) so I am guessing from reading on here I have the Heterozygous. Is that right? I do not understand all of this and I am so overwhelmed by this. My Dr. put me on a medicine food called Podiapn because I can not afford the L-methylfolate. I am disabled and Medicare nor Medicaid will pay for this. Is this safe to be on?? I met a person who has the same mutation and she has never heard of Podiapn and she said on your website you don’t recommend presciptions for this. Any info you can give me would help me so much. I know I have more questions but was wondering about this. I go to my Dr this Friday June 20,2014 and will try to get more info from her. Thank you for an help you can provide…..

  • Robin McStay says:

    Hi Dr. Ben,

    My son is eight years old and has a complex medical history.

    He was apparently normal until he was approximately two years old, then began having some “autistic like behaviors”, absence seizures, gelastic seizures, and eventually a full range of drop seizures, status, and severe cognitive loss. He was first diagnosed with Lennox Gastaut Syndrome, but ultimately diagnosed at Lucille Packard with a Hypothalamic Hamartoma.

    The hamartoma was resected at Barrow Neurological Institute in June 2010, and he has been seizure free since that time. His cognitive decline stopped and he has made many strong advances, but he has not recovered.

    He has several comorbid symptoms that I wonder if the cound be attributed to MTHFR. he has a lisch nodule in his eye (as I understand, NF1 has been definitively ruled out). He is very large in stature, above the very top of the growth chart for both height and weight, though his testosterone levels have not yet started to increase. His appetite is that of a grown adult, but he does not accumulate extra body fat. He is not diabetic or hypertensive. His sweat smells VERY STRONGLY OF AMMONIA.

    In addition to cognitive impairment, he also has problems with emotional dysregulation, and he has certain OCD and ADD/ADHD and anxiety symptoms.

    Thank you for your opinions on this matter.

  • Anne says:

    my Spectracell test says A1298C Heterozygous
    not AC or CC

    What’s this?

  • Lauri Ongley says:

    I recently found out that I have mthfr C677T and A1298C so I know I passed it on to my daughters. My youngest was told to take folate and did so for about 2 years. I know it wasn’t the methyl form of folate. Could it have harmed her to take it? Thank you for your help.

    • Heather says:

      I am compound heterozygous.
      From my understanding is that you get one copy from mom or dad..
      Doesn’t exactly mean they will have the same mutation , if any.

      My sons came back compound homozygous and from what that doctor told me he got one copy from me, one copy from his father.

      Someone please correct me if I am wrong.

      I have been told ridiculous stuff from misinformed doctors, what you can do is read Dr. Lynch’s information and YouTube videos. I have received no help from doctors in my area.

      I recently called a doctor and asked flat out, plain and simple if he could help me as I absolutely feel a lot of what I am going through has a lot to do with MTHFR and I want that route deeply explored by a qualified physician.
      I made tons of calls and finally this doctor said yes. A week later I’m sitting in his office and he is telling me my two copies that have me positive actually cancel each other out, like a math equation, which makes me normal after all.
      Well. Well. Well. I’ve never heard of this before I say !
      I was his last patient of the day. Just him and I. He had no intention of helping me or do anything for me.
      I started crying in his office at which point he told me it was time for me to go.
      He billed my insurance for 600.00 for about 7 minutes of his useless time.
      I was so upset I could hardly drive home.
      I’ve been trying to find a doctor for two years.

      All I can do is hope and pray a doctor like Dr. Lynch will come along , a doctor who actually cares.

      I mean no disrespect to the doctors out there that do care.

  • Jennifer says:

    Dr. Ben,
    After a miscarriage, and almost dying from blood cots after my second pregnancy and my half sister’s son having a stroke at the age of two. Our family began genetic testing. My sister, my nephew, my niece, my mother, and one son all have Factor IV Leiden and MTHFR. I also have another child who was only diagnosed with the MTHFR. I have been prescribed Foltx to take daily. Neither of my children have been prescribed any type of daily regimen. During pregnancies, I had to see a high risk OB along with my regular OB and take Lovenox injections every 12 hours in my stomach, towards the end of pregnancy, they switched me to Heparin injections every six hours. I had twins that arrived 8 weeks early, but are healthy. One twin did not inherit either, and the other inherited both. Then I had another pregnancy, did the same regimen, and he came about 5 weeks early, he is healthy, but got the MTHFR mutation. How important is if for me to know the details of our mutations? I was not given that specific information, but I was diagnosed over 10 years ago and VERY FEW medical providers had even heard of it. To this day, it’s getting better, but most look at me like “huh?”. I would appreciate any information you can offer.

    Thank you,

  • talia hewitt says:

    Hi iv had 1 stillbornhe was 41+1 weeks 2 misscarages 1 complete the other I had the D&C opp I have this gene and also my partner I am on B6 B12 B1 and also megafol5 and just need help as I want a baby and its getting me down as its all I ever wanted for the last 3 years
    Thank you

    • Hi Talia. I am so sorry for your loss. I would like to recommend that you read my book, Brighton Baby. It is available at It is over 1,000 pages long and goes through preconception and provides lots of great insights for how to prepare your body for a healthy pregnancy. Wishing you great success and love.
      Dr. Dittman

  • Alicen says:


    About 3 years ago randomly one night i woke up with what i thought was a UTI as i have had many in the past. I went to several different doctors and a UTI infection was no where to be found in my urine sample. Finally after many doctor and ER trips i was referred to a Urologist. They diagnosed me with IC. At about that same time i randomly woke up in the middle of the night with the worst cramp in my calf that i have ever had. No warning signs earlier in the day, nothing. The cramps and the bladder problems have not stopped ever since that day. I CONSTANTLY have twitching in my legs and feet and cramp to the point that i cannot move or walk. I have had to be carried out of stores, stuck in positions that i cannot move, etc because the cramps are so intense. I had several nerve conduction tests done, all coming back with the result of “over active nerves” but no further diagnosis. I have been turned down by doctor after doctor after doctor because while my symptoms are there, no one knows why this is happening. I also get tingling in my feet occasionally. I have had MIR’s done on my spine and brain and they all came back normal. I have had labs done to test for low vitamin levels, liver tests, etc. My liver test came back a little abnormal and they also have no answers for that. I have been on 900mg 3x a day of Gabapentin and also 20mg of Baclofen 3x a day for the last 2 or so years. My urologist is the only doctor that seems to care, and is trying to help me figure out my leg cramp/twitching issue even though that is not necessarily in her field. She recommended me to your site, and i am hoping you might have some answers. I have not had the blood work done for the MTHFR that i see most people talking about on here. I also have severe anxiety and have addiction issues 4.5 years ago. I am 100% now and do not drink or anything else. My urologist wanted to start doing more blood work since my symptoms have suddenly started to get worse. Do you think getting tested for MTHFR is something that i should do based off of my symptoms? Desperatly looking for a doctor that is willing to help and point me in some sort of direction to figure this all out. I am in constant pain and cannot do certain activites that i was once able to do. 25 year old female. 1 ectopic pregnancy 4 years ago before any of my other symptoms started to occur. My right side falopian tube has been removed. Please, any suggestions would be greatly appreciated.

    • Hello Alicen,

      Not knowing much about your case, I would suggest looking into having a hair mineral analysis done and interpreted by an experienced practitioner. I would guess that your calcium-mineral ratio is off and that you have a copper-zinc imbalance. This can affect the nervous system and your muscle relaxation response (among other things). It would at least give you a good first map that could lead to other things. Also, have you been tested for heavy metal toxicity, in particular aluminum and mercury? Quicksilver Scientific has a Mercury Tri-Test which is able to better assess mercury burden through fish, vaccines, mercury amalgams, and other environmental exposures. This can profoundly affect the nervous system and trigger an underlying copper-estrogen-candida imbalance.

  • robin says:

    I have tested positive for mthfr because i was anemic and my b levels were past 2000. i am now on methylated b vitamins..

  • Penelope says:

    Hi Ben,
    I got told I have heterozygous C677T. I have Spina Bifida and need to take 5mg folic acid. I am now on methyl form compound vitamins.
    do I need to avoid all B vitamins and all supplements that have them (even if they are in there in small amounts)? And take 5mg folinic acid instead of Megafol?

    • Yovanna says:

      Just commenting since I’m fascinated by this post.
      I’m new to all this and had my genetic testing through Ancestry, and then put the raw data through Promethease. I have the heterozygous C677T (rs1801133(C;T) AND spina bifida! Fascinating to see how genetics plays a factor.

  • HeatherNicole says:

    Hi, I’m hoping someone here can clear this up for me. Hi, Dr. Ben! I hope you get this. Does the finding of rs1801131 C;C indicate a result of being homozygous for A1298C? I recently found out that my son is homozygous for A1298C, but is it CC or AA? My result was rs1801131 A;C, which I know is heterozygous. My mother is rs1801131 A;A. Which one is “normal,” and which one is homozygous, CC or AA? Thanks so much to anyone who can help me!

  • Tammie says:

    I know very little about MTHFR. But i got tested because it runs in the family. My results were 677C>T Homozygous on BOTH chromosomes AND 1298A>C Heterozygous on one. Is it possible to have 3 mutations? or is this a mistake? And what does that mean? Where can i find information on this and what supplements should i be taking?

    • Dr. Aron says:

      Hi Tammie – Yes. This is possible to have this result. What this means is that you may be more susceptible to methylation dysfunction. Factors like diet, lifestyle, and stress are important factors in how you feel. A clean diet and healthy lifestyle may be all you need. Please see the Starting Protocol where Dr. Ben goes into detail about the diet and lifestyle recommendations for anyone with MTHFR gene mutations:

      Hope this helps.

      -Dr. Aron

  • Martyns says:

    Hi Dr Ben,

    I’ve just had the gene testing done and the results are –

    MTHFR (CT77T) Homozygous wildtype CC

    MTHFR (A1298C) Homozygous variant genotype CC

    Can you please help me interpret what that means?

    • Martyns says:

      Sorry a correction-

      *MTHFR (C677T) Homozygous wildtype CC

      MTHFR (A1298C) Homozygous variant genotype CC

      • Dr. Aron says:

        Hi Martyns – MTHFR (C677T) Homozygous wild type CC is 2 copies of the normal variant in the population, so no mutation. MTHFR (A1298C) homozygous variant genotype CC is two mutations at this gene location.

        From one of Dr. Ben’s previous comments:

        What you have are two copies of the A1298C MTHFR mutation which means you have a defective BH4 pathway and this can lead to a multitude of symptoms.

        Neurological, mental, muscular and sensitivity to chemicals are common for this mutation.

        You do have a chance to be well or at least much better if you begin to address the A1298C mutation.

        Hope this helps!

  • Martyns says:

    Thank you very much, that does help a lot.

  • Martyns says:

    I’m not sure if you could helps me with this but along side the gene test i had some other blood work done.

    Things that were of note were my zinc, magnesium and manganese, vitamin C and Vitamin E, essential fatty acids (EPA, DHA, and Lauric acid).

    What was high was my B12 and also my levels of SOD. Are either of these a concern?

    When I had my hair mineral analysis down a couple of years back my lead and mercury levels were high. Could heavy metals be responsible for the high levels of SOD combined with the depletion of antioxidants?

    I will be getting my hair retested soon to see where I stand with that but need to let me hair grow out a bit first.

    I also had various gut issues in the past which I have now managed to get under control through manipulating my diet and ensuring i include a high intake of probiotic foods.

    Now obviously i’ve upped my intake of the low nutrients to help address this and will be looking to include a methalated folate supplement.

    Overall my lifestyle is very good, I eat well, sleep well and manage my stress pretty well too. Bi polar disorder runs in my family but so far i’ve only had one ‘wobble’ a few years back during a particularly stressful period at work.

  • Lisa says:

    Can you be homozygous for both strains of the mutation? The C677t and the A1298?

  • Kirsten Norgaard says:

    Please help! I tested positive for mthfr and my results say C665t LLS heterozygous…

    • Helen hallett says:

      Please help. I had a test done and they told me I have MTHFR c.665C>T. Can you help me understand this. The doctors said I have to have a blood test for folic acid. I have hashimotos and fibromyalgia,
      arthritis of the nee and hands, lost sight in one side of my eye which now returned. Please help

  • Kelly says:

    Hi Dr. Ben,

    When I was pregnant with my first I had genetic testing done, I am compound heterozygous- C677T/A1298C. My daughter ended up being fine and I forgot all about it. My doctors never seemed concerned or gave me information. We are now trying for our second and have had one miscarriage and haven’t had any other luck after a year. How much would this be caused by my diagnosis and what can I do to counteract it?
    Thank you!

  • Christina says:

    I have 2 copies of 677t and one copy of 1298 what does that make me

  • Maureen Harris says:

    hello, Dr Ben I’m from South Australia and I have MTHFR Homozygous CC mutation and have all symptoms of Vit B 12 deficiency particularly concerning is the brain fog weakness & fatigue, muscle pain & wasting, & burning, twitching. Dr gave me a B 12 injection of 1 ml hydroxocobalamin a week ago, which gave me headaches and bad gut cramps, my head feels a bit clearer but my eyes are still sore. Previously I had Methy Max which has Cyanocobalamin & calcium folinate which should have suited me but it made me feel worse. (I am not on calcium folinate at present as I stopped as my symptoms did not change as the Vit B12 (cyancobalamin )treatment I had 8 years ago did not reverse the symptoms.)
    I’ve been struggling with chronic fatigue since then.
    My Dr wants me to start on “Seeking Health” Active B12 hydroxocobalamin Lozenges.
    I am wondering if the Active B12 Lozenge with L-5-MTHF, would be more suitable for me, than the Active B12 hydroxocobalamin? Is methylfolate easy to be absorbed when I was told 10 years ago I needed to be on Calcium folinate for life as I could not absorb folic acid.

    In summary I really would like advise on which form of Vit B12 lozenge would be best for the double mutation I have. Or do I need to experiment?

    Kind regards,
    Maureen Harris

  • cathy nutting says:

    Dr. Ben, I was tested by HealthDiagnostic LaboratoryInc a few years ago. My result “this patient has the normal or wild-type genotype for the MTHFR C677T (C/C) polymorphism and is heterozygous for MTHFR A1298C (A/C). The A1298C A/C genotype may result in reduced activity of MTHFR, potentially leading to dimished production of L-methylfolate, the active form of folate. Reduced levels of L-methyfolate lead to decreased production of neurotransmitters, reduced conversion of homocysteined to methionine, and reduced SAMe concentrations. CNS neurochemical deficiency along with buildup of homocysteine and decreased availability of methyl groups from SAMe may increase an individual’s risk for developing cardiovascular disease. Additionally, this may predispose an individual to certain psychiatric disorders and/or memory and attention deficits. Patients with the MTHFR A1298C polymorphism may consider supplementaion with the active L-methylfolate in combination with Vitamin B12. Increased homocysteine levels may reflect of conditions.” I have been healthy (I am 58 years old and delivered 4 healthy babies and never had a miscarriage) My only health issue is insomnia which is very severe. It is normal for me to sleep 1-3 hours or not at all. I have been to multiple sleep specialists and have been on lots of different meds. I am now seeing a naturopathic nutritionist who said this gene mutation could be the root cause of my severe insomnia…is this possible and is there anything to do about it? Thank you very much, CAthy

  • Hanna says:

    Hi dr.Ben.
    Could you please help me with this?
    I am 32 years old and had 3 miscarriages , my blood result is homozygous CC for C667t and homozygous AA for A1298C. What does this mean? Can this mthfr result be a problem for pregnancy and if so how can this be treated?

  • Cheryl Vasiliou says:

    Makes sense for most part so far!

  • Stephanie Relly says:

    Hello, I have questions regarding my labs. My doctor had these done and mentioned that I have the mutation, but I am pretty confused. This is what the lab result looked like:
    677C>T Wild
    I have a lot of pain in my legs among other issues. I am desperate to see if this could be part of the problem. I also just feel “toxic” inside, if that makes sense? Thank you. I am pretty discouraged. Also, my daughter has extreme pain all of the time, was just diagnosed with Hashi Motos and Lymes, but I am wondering if this could be part of her problem?

    • Dr. Aron says:

      Stephanie – MTHFR is one part of the puzzle and could be related to these issues. Hashimoto’s and Lyme can definitely be a cause of your daughter’s pain. Please reach out to a doctor on the Physician Directory. You will want to find someone who is trained to work with Lyme. With proper Lyme treatment and focus on diet and lifestyle, there is hope that she will get better. Take a look at the Basic Protocol to get an idea of Dr. Lynch’s general approach. Wishing you all the best.

  • jen says:

    Hi dr.
    I have recently had this test done to check to see if my antidepressants were a correct match. I’ve been on the same ones for years but still not satisfying the anxiety side. I’ve done therapy for years and taken anxiety classes. While I’m able to run a company and succeed in many aspects I still can’t quite conquer this one. Can you explain what these 2 possibly mean. My genotype came back c/c and a/c reduced activity.

  • Stella says:

    I was wondering if you could help me. I live in Korea and I recently got tested for this mutation.
    I have the following on my lab test result sheet.
    C677T – Heterozygote CT Wild type and 1MTHFR gene (A1298C) Heterozygote wild type.
    I have been attempting pregnancy for 3.5 years and having never succeeded it is difficult to know if this would have been a problem.
    However, my question is regarding now. My RE has prescribed me an extra strong daily dose of folic acid, my understanding is that actually this may not be helpful to me.
    Please can you advise what I should be taking prior to my next round of ivf, anything to avoid etc. It would be really helpful to understand what these results mean for me,
    Many thanks

  • Leslie says:

    After having Boston Heart Panel and SpectraCell Lab Micronutrient testing in November, was diagnosed with 677 C/T 1298 A/C so just starting the journey to understand all this. What does this mean for me exactly? Also have functional deficiency for copper and 4 border line deficiencies in choline,manganese chromium and zinc. Homocystine has been normal pretty much. First pregnancy was a miscarriage, then two health pregnancies although for one I had gestational diabetes. Did not become Type 2 diabetic until a year ago. I am 64. Conditions that have been problematic and for which I have sought treatment over the past few years are metabolic syndrome, depression, hypothyroid, migraines, Type2 diabetes, sleep apena and recently experiencing a lot of insomnia and disruption in normal sleep. Not a lot of energy lately. Huge history of cancer in my dad’s family. Have testing scheduled for Lynch Syndrome in Feb. Treatment plan includes paleo diet, a few more supplements added to what I have been taking, more exercise. Things I have already been trying to do over the last few years with varying success. Overwhelmed and confused with the information out there on the topic and wish more of it were in plain English. Not fully clear on exactly what it all means.

  • Sara says:


    I am MTHFR C677T and A1298C and i have a really high B6 reading at the moment of 2250 (range 20-190)
    I do take gaba x 2 or 3 a day that has 2mg per pill so i take say 6mg pd which i think is more than i should.
    I am just trying to understand the link ???? (all a bit new to me)
    I need to get heavy metal tests done do you suggest blood or other? thanks Sara

  • Trish says:

    Is it possible to be homozygous 677/1298?
    All the info on MTHFR mutations that i see has only heterozygous 677/1298 as a possibility. Is it not possible to have the 677 and 1298 mutation on the same half of he gene, with 2 copies making homozygous 677 and 1298?

  • Jason says:

    My girlfriend was just diagnosed with a methylfolate mutation. Her lab results list it as a1298c. So would that be the heterozygous mutation listed above as 1298ac?

  • Nicole says:

    Hi, I just found out that my step daughter has the MTHFR heterozygous C677t1 A1298C. I have a 1 year old son should I have him tested?

    • Dr. Aron says:

      Nicole – You may want to run the test if there is a clear reason to run it. If you or your son’s father have a significant medical history or your son has congenital health issues, it might be a good information to have on hand. Knowing his MTHFR status is one piece of data that has to be incorporated into the whole picture.

  • Brittany Gray says:

    Hello I am in need of help. My 7 year old son has been through the ringer and we have been searching for answers. He had some genetic testing and I am having difficulty reading/understanding all the info all 3 Drs are giving me different and even conflicting information. Under MTHFR it reads ” c667t, ct”then “a1298c, ac”then “intermediate activity” his labs show an excessive amout of vit b12 (2000 which is more than 1000 over range) and folate 20.0 (it says less than or equal to 7.3 is where he should be) One Dr says there is no problem with it, another seems worried about it and repeatedly asked if I gave him folate supplements. The other had no idea what I was referring to so he looked it up on his phone and said it would be depleted not elevated if there was anything to worry about. I have a 2 year old neice that has been having terrible year (ie having seizures ect) and the special Dr they take her to said this mutation played a large part in that. I am currently trying to find ANOTHER dr for my son but could use some guidance and advice in the meantime.

  • Me says:

    NADPH is 5,10-methylenetetrahydrofolate reductase.

    No it isn’t.

  • Me says:

    DNA nucleotide is made up of pyrimidines

    No it isn’t. A nucleotide consists of a sugar, a phosphate group and a base. The base can be a purine or a pyramidine.

  • Rebecca London says:

    In the information given from above in the “What is MTHFR?”, MTHFR C677T is not listed under “What are the most common MTHFR gene mutations?”. Why is that please?

    Researchers present MTHFR mutations most commonly like this:

    MTHFR 677CC = a normal MTHFR gene
    MTHFR 677CT = a heterozygous mutation which is one mutation
    MTHFR 677TT = a homozygous mutation which is two mutations
    MTHFR 1298AA = a normal MTHFR gene
    MTHFR 1298AC = a heterozygous mutation which is one mutation
    MTHFR 1298CC = a homozgyous mutation which is two mutations
    MTHFR 677CT + MTHFR 1298AC = a compound heterozygous mutation which is one mutation from two different parts of the gene

  • Francesca says:

    I had four miscarriages and a placental abruption. It was then I had genetic testing and found to have MTHFR 677CT and 1298AC. At age 35 and 36, I finally had two healthy children on Folic Acid and Heparin. I was told after pregnancy I would be okay on aspirin. However, at age 38 I suffered a stroke and age 40 had a total thyroidectomy with a right neck dissection due to thyroid cancer. I am presently on Plavix and Synthroid. I have pushed through life with anxiety, depression, ADD but am hesitant to take any more medications. Any suggestions?

  • Francesca says:

    I had four miscarriages and a placental abruption. It was then I had genetic testing and found to have MTHFR 677CT and 1298AC. At age 35 and 36, I finally had two healthy children on Folic Acid and Heparin. I was told after pregnancy I would be okay on aspirin. However, at age 38 I suffered a stroke and age 40 had a total thyroidectomy with a right neck dissection due to thyroid cancer. I am presently on Plavix and Synthroid. I have pushed through life with anxiety, depression, ADD but am hesitant to take any more medications. I have asked several physicians, no one seems to be concerned. Any suggestions? I am sure what I should be taking.

  • Jorgen says:

    Why do you (author) call it mutations? That is not correct! They are INHERITED variants.
    Not very credible if you get these basics wrong…

    • Dr Lynch says:

      Jorgen –

      Because people understand ‘mutation’ – they don’t understand ‘variants’

      Being technically correct is useful many times – and other times it causes more confusion.

  • Marci says:

    Could this mutation have any connection with my Son having down syndrome? Could this mutation have anything to do with thyroid and or insulin problems?

  • Sheryl says:

    I would like to know if you could simplify the meaning of this MTHFR gene? Like what does it mean to have it? You know causes and symptoms? I know I have it but I do not understand it.

  • Tony Wilson says:

    Hi Dr. Ben, I have been fighting symptoms and anxiety all my life. I am 42 now, twenty years ago my psychiatrist put me on benzos, I got addicted, went to opiates…. Now I have been on suboxone for 4 years. Last month my Dr. did a genetic test and results show : MTHFR: 677C>T CT; COMT: Val158Met AG; SLC6A4: S/La
    She put me on 800 mcg.of Folate and on my 3rd. day I was feeling awful with a feeling of tension in my brain. I started doing 400 mcg. every other day for two weeks and then 400 every day. I don’t feel as bad but not great either. What do you think I should take to help me assimilate better the folate?
    Thank you so much for your time and help.

  • Gretchen Heinrich says:

    I am confused
    My test said:
    “The individual is homozygousfor the T allele of the C677T polymorphism in the MTHFR gene. This genotype is associated with significantly reduced folic acid metabolism, significantly decreased serum folate levels, decrease serum folate
    levels etrc

  • Lin Weinberg says:

    Hi there,

    Recently a client received a report stating “You have tested to have the normal or wild-type for MTHFR C677T (C/C) polymorphisim and are homozygous for MTHFR A1298C (C/C). ”

    Currently I’m researching opinions on MTHFR in relation to fertility. I’d love to know your thoughts. What would you say to the person above? Would you advise methyfolate? Which brand?

    • Dr Lynch says:

      Hi Lin –

      Their MTHFR is reduced in capacity by about 40%.

      I’d have them read this article -and you as well – and recommend the prenatal protein powder, krill oil, fish oil, liposomal vitamin C and probiotics to start.

      This video is also a must watch:

      I of course recommend my brand, Seeking Health, as I research in depth and the result are the formulations I create.

      Having MTHFR polymorphisms is not as simple as providing just one nutrient – methylfolate. Unfortunately.

      If she and your other clients follow the recommendations in the video and article link above, I believe you’ll have many successful pregnancies.

      Thank you for expressing interest in identifying other contributing causes to infertility. Kudos!

  • Heather says:

    Hi there

    I am 42yo. It was diagnosed during my 2nd pregnancy (2007) that I have a MTHFR gene mutation (A/C1298). I had twins born spontaneously at 31w prior to my 2nd pregnancy which resulted in a healthy full term baby. Of course we can never know if my pre-term babies were just because they were twins or something else. My obstetrician tested me for MTHFR gene mutation because of my pre-term birth history and also because my mum had a stillbirth and strokes in her 50s (she was however a heavy smoker).
    Anyway! I took folate 5mg and B12 and B6 supplements through my 2nd pregnancy and after that I kinda forgot all about this whole MTHFR thing! Until recently I remembered about it. Now that I am older I am becoming more conscious of the potential effect of this mutation on my health. I looked back in my pregnancy notes and the doctor has simply written MTHFR A/C1298 – is this the same as A1298C or 1298AC? Just a different way or expressing it?
    And more important, what does this really mean for me?! Should I be taking supplements now or were they only relevant in pregnancy?

    Would appreciate any guidance.
    Kind regards
    Heather ๐Ÿ™‚

  • Diana says:

    I have 2 copies of A1298C and no copies of C677T. What does this mean?

  • Amy says:

    I had a genetic test for MTHFR. The test results read: (My name) has a restriction digest pattern consistent with being a c.665 C/T heterozygote.

    The doctor told me my test was negative, but at the bottom of the of the comment section the pathologist wrote: “Genetic counseling is recommended”.

    Did my doctor interpret my test incorrectly? What should I do at this point? I have multiple autoimmune conditions.

  • Douglas says:

    Hi, My test result shows 677C>T: Normal, 1298A>C: Homozygeous. What does it means?

  • tracy says:

    I just got results back on MTHFR and it says MTHFR rs1801133AG heterozygous. I am not sure how to interpret the 677 or 1298 from this info…

  • Annie says:

    Hi! I had genetic testing and it came back with mthfr c677t genotype c/t; A1298c A/C-mthfr genotype is associated with low enzyme activity. My doctor said I tested positive for both but told me he doesn’t know much about it and that I need to do my own research. Is there anything I can do or take so I feel better?

  • whitney carter says:

    I was just diagnosed as a carrier of MTHFR heterozygous for the C677T with one mutation. Should I be on Methylfolate supplements? My multi vitamin has 400mcg folic acid in it and I just bought some methylfolate supplements that each pill has 400mcg in it. This gene is so confusing…

  • Pamela Sage says:

    Just happened on your site. I am a 51-yr-old female. Unfortunately, I didn’t get any genetic testing until I sought some on my own a couple of years ago. I don’t know if I have any additional mutations that were not included in the test but I am compound heterozygous for the mutations at 677 and 1298. I have Goldenhar Syndrome, had a late diagnosis of autism spectrum disorder (Asperger’s), major depression, anxiety disorder, severe tinnitus in the left ear (am having an MRI next week). I also have metabolic syndrome/PCOS. However, a gastric bypass in 2005 reversed the diabetes and high blood pressure. I just run high cholesterols now. I take 15 mg methylfolate and antidepressants and am under the care of an internist and psychiatrist. Is there anything else I should be doing?

  • Sonia says:

    I so much need to know your opinion about my struggles with depression since 2004.7 different doctors and not even one recomandation on hormones etc.I have been on cymbal ta for 7 years and just decided to stop taking them.Well I am always angry there is something wrong .Please let me know what steps do I follow.I definitely think I am low on serotonin.How should I replace the antidepressant with natural supplements?
    So much in need for help .My little girls are so tired of me been angry all the time

  • Angela K Abner says:

    Dr. Ben,
    My brother was diagnosed with an MTHFR 677CT + MTHFR 1298AC. He has uncontrolled DM despite traditional treatment (Novolog, Lantus, Glucophage, etc). He has recently had a unexplained stroke…and a previous retinal detachment. Would his MTHFR 677CT + MTHFR 1298AC have an influence/bearing on this seemingly untreatable diabetes? I should also note that he is a active and very health conscious and at goal weight even prior to the diabetes. .

  • Kathryn says:

    My friend is looking for information on Heterozygous A1266c MTHFR. We can’t seem to find much of anything out there. Do you have any information on this?

  • Nicole K says:

    Hi Dr Ben,
    I just received results back from a Vibrant America test, and the results read in a way that I’m having trouble interpreting:
    677C>T C/C Homozygous Wild
    1298>C A/C Heterozygous

    Could you please confirm the meaning of this? My doctor tried to explain it as a ‘minor’ mutation, but I’d love to understand this deeper. Thank you!

  • Patricia Clews says:

    I just read this article on google news about the writer’s heart tests and I’m trying to understand these MTHFR mutations but wondering if this is true as I thought it wasn’t.
    “This patient has heterozygous mutations at position 677 (CT) and position 1298 (AC) of the MTHFR gene, which provides instructions for an important enzyme that processes amino acids. Compound heterozygous mutations are associated with decreased coronary artery disease or venous thrombosis.” Thanks in advance.

  • Wendi Lundquist says:

    I have the following for MTHFR TT-677/AA-1298. I know have some mutation but would like to know what that means for me. I supplement with L-methylfolate. will that help to prevent sequalae of this mutation? thank you!

  • Heather says:

    I am compound heterozygous, I was finally diagnosed with this on my 4rth out of 5 miscarriages. The only question I have is: what is the percentage of rarity between the different types when it comes to population. I cant find those numbers ANYWHERE. I have found all this helpful information, but when I was diagnosed with this I was told that it was “rare”
    Whenever I mention what I have, the doctors look at me with stupor, as if they have no idea what I am talking about. There was one doctor I did mention it to the best way that I could and she told me that I would have to see a hemotologist.
    Thanks for any insight you can give.

  • Elizabeth Peters Wilson says:

    I recently did a DNA test for my son and daughter to find out what ADHD meds would be ok for them. When the test came back it flagged both of them for being MTHFR, heterozygous for the C677T polymorphism. I was curious about the genetic link and looked at my 23&Me account only to find that I am heterozygous for the C677T MTHFR mutation and homozygous for the A1298C MTHFR mutation. I am brand new to this and I am overwhelmed by what it means and how to best help them and myself. I watch the video with you being interviewed by Dave Asprey. It was great but a lot to take in. We are all gluten and dairy intolerant so those are not in our diet. Also, I plan on switching us from Folic Acid to Methlyfolate but what else should we be doing? Thank you for your help.

  • Rose says:

    Hello. I’m a bit confused. My data sheet from Genetic Genie tells me I have C677T and A1298C. It has the 677 as -/- in green i.e. not a problem, and the 1298 as +/+ in red i.e. a problem. The alleles are GG for both. But your article above seems to suggest that this combination = “MTHFR 677CT + MTHFR 1298AC = a compound heterozygous mutation which is one mutation from two different parts of the gene.” Please could you clarify this for me? Many thanks.

    • Ashley says:

      The compound kind that he has is one copy of each, not two copies of only a1298c variants and you have no copies of c677t variants.

  • Anita Adams says:

    My daughter was diagnosed with Compound heterozygous MTHFR mutation C677T/A1298C (HCC) 2 years ago at age 18 and is now 20 (college student). I’m trying to sort out what this means and if it’s different than regular MTHFR. At the time she was told about this (Cleveland Clinic Functional medicine) we were busy dealing with things like IBS (and HS graduation), so other than beginning to take folated B12 I’ve done no research. I’d love a 5th graders version of what this is and how we should approach it. (P.S. Due to cost and lack of insurance we had to stop seeing this practitioner)

    • Patti says:

      I watched a good video on you tube that explained it pretty good. I haven’t been tested but I chose the methyl form of b12 years ago when my thyroid meds didn’t help the fatigue. It has helped. I hope the ibs is better but in case not, I found culturelle or digestive advantage for gas to help a whole lot. I do take zinc separate from copper and that may help but I’ve had ibs d for over 35 years and the probiotic is a blessing. I am sure the first one increased my vitamin d though so one should keep that in mind, don’t want too much or too little. This MTHFR thing is something I’m wondering about so I saw your post.

      • Pamela Sage says:

        There are a lot of issues that can cause IBS like issues. I do have IBS, but it wasn’t as bad until 2005 when I had gastric bypass and gall bladder removal surgeries. The metabolic syndrome that necessitated the gastric bypass surgery, is probably MFTHR related. Metabolic syndromes are fed by hormones produced in the intestines, which is why gastric bypass of part of the small intestine is very effective in reversing Type II diabetes, cessation of menses, and other symptoms of metabolic syndromes. So, in a nutshell, MFTHR mutations do affect your intestines, but other causes for your intestinal problems should be ruled out — a lot of things csn throw off the plumbing.

    • Pamela Sage says:

      ‘You can get a better overview of MFTHR mutations elsewhere. There’s plenty of material here and elsewhere on the Internet. However, as a compound heterozygous myself, I can tell you some of the manifestations I’ve seen in myself and my family. I was born with Goldenhar Syndrome and have dealt with major depression most of my life. Having been assured by a geneticist who without an actual genetic test assured me Goldenhar Syndrome was not genetic, I did not get a genetic test until after a diagnosis of autism spectrum disorder in my late 40s which cost my professional career and worsening depression and general deterioration, I took the opportunity to do a genetic test while visiting a local health food store. The compound mutation has been linked to a number of neural tube disorders. Craniofacial syndromes, spina bfida, autism, though other mutations may be involved (I’ve not a had more than the limited test that caught the MFTHR mutation.) Though no one else has Goldenhar Syndrome, I’ve noticed some autistic symptoms, depression, and minor genetic or neural defects such as spina bifida occulta or familial tremors running on my father’s side of the family. I’ve had suspicions about possible carriers on my mother’s side of the family as well. The mutations can also be linked to cardiovascular problems and metabolic syndromes. I have PCOS but was able to reverse diabetes and high blood pressure and keep off some of the weight gain through a gastric bypass which affects some of the hormone signals produced in.the gut. It is good that your daughter was diagnosed young. Inability to process folic acid, would otherwise cause deterioration as she ages. She (and you) need to take methylfolate. My psychiatrist prescribes 15 mg. If contemplating pregnancy, she will need to be extra sure to make sure she is supplementing properly to minimize danger of birth defects.

  • Ryan Wolfe says:

    My husband has 1298A>C AC & 677C>T CT, I have 1298A>C AC & 677C>T CC, and my daughter has 677C>T CT & 1298A>C AA. I don’t know how to make sense of this. Our reports don’t give much of an explanation. All it says is “Reduced MTHFR Activity”. Are there things we should avoid or specific supplements we can take for optimal health? Is there further testing we should do?

  • kristin says:

    Ive googled until my fingers are sore an no one addreses what the lab result will say next to the MTHFR 677 and 1298 and it is C/C, A/C A/A C/T AND T/T with %’s inside ()’s. ie. A/A (~58-63%) and so on. Can SOMEONE on gods green earth please answer this?! It is the only way to read the actual test, it doesnt say homogenous or whatever all this words are. It gives a code with %’s!

    • Dr Lynch says:

      Hi Kristin –

      For MTHFR 1298, the wild type = A and the risk allele = C. So if one has 1298 C/C they are homozygous for the risk allele and have decreased function – by about 40%

      For MTHFR 677, the wild type = C and the risk allele = T. So if one has 677 T/T they are homozygous for the risk allele and have decreased function – decreased by about 70%

  • MaryEllen Lewandowski says:

    I have had a blood clot and DVT. Is this because I have Normal or wild type genotype for MTHFR C677T(C/C) polymorphism and is homozygous for MTHFR A1298C(C/C). ? I also am having problems now . Thinking auto immune disease.

  • Kathryn bulis says:

    I am an individual who is homozygous for the T allele of the C677T polymorphism in the MTHFR gene. Or so states on my GeneSight. Please help!!!

  • mery says:

    Buonasera Dr Lynch,
    questi sono i miei risultati
    MTHFR – C677T Polimorfismo risultato Genotipo C/T Eterozigote C/T
    MTHFR – A1298C Polimorfismo Genotipo A/C Eterozigote A/C
    Mio padre ha avuto ictus e infarto,
    mia madre un cancro al pancreas, cosรฌ anche una sorella e la figlia di altra sorella;
    Vorrei capire se il risultato del mio MTHFR mi mette ad altro rischio e quale cura di supporto posso fare. Grazie dell’attenzione e grazie mille in anticipo della risposta

  • Pam says:

    Uh five years ago I was diagnosed with a Double Hetro genous MTHFR 2 from mom and 2 from dad….. Now what… …

  • Fiona says:

    Hi there, I have just been tested for this and my results have come back as two copies of c677t homo and one copy of a1298c. What does this mean for me I display some variety of symptoms

  • Christina says:

    Tested MTHFR c.665c>T heterozygous & C.1286A>C
    I have Hashimoto’s. I had thyroid cancer. I have adrenal problems & now being tested for Cushing’s.
    What do these MTHFR genes mean for me?

  • Have any of you guys considered looking into nutrigenomics? all this worry about genotypes etc. How about just encouraging the healthy expression of the gene using plant compounds which dont cause any side effects like the toxic drugs? keeps things really simple. I know of 1 herbal formula that addresses every problem involved in MTHFR gene defect.

  • Debi says:

    I ran my 23andMe report through NutraHacker and the results for MTHFR shows rs1801133 AG:1/2. Consequences show: when homozygous itโ€™s functioning at 30% of normal, leads to high homocysteine, folate concentrations lower. What does this mean?

  • Lauren Harris says:

    Hello Dr Lynch!
    I am making my head dizzy trying to understand my genomind test results.
    It says C677T then, underneath that C/C. Then, A1298C A/C and then, underneath that.. [NORMAL]. Initially, i thought that just meant it was normal.. but now I am confused from everything I am reading.
    Thank you for your help in advance!!!!

  • Anita Hardmeyer says:

    I am trying to interpret some raw data on 23 and Me. All end with a double letter that is the same such as GG CC or AA. There is only one that ends with different letters . Rs55686944 has CT. Is this a variant?

  • Danielle A says:


    I would please like some help understanding my MTHFR mutation results.I took the Boston Heart Diagnostic early this year and found that I have 677 T/T & 1298 A/A.

    I am now 7 weeks pregnant. Today had an ultrasound and we found a healthy heartbeat and all looked great. I am on prenantal vitamins made for woman with mthfr mutations and took it 6 months prior to getting pregnant. However, I am not on baby aspirin or any other blood thinner. My doctor knows I have MTHFR but does not know what variant. I just started seeing him and he said aspirin is my choice but that he wasn’t insisting. I trust him, but i also want to understand what I have more clearly so I can make a decision.

    Please help! Thank you.

  • Shawna Hixon says:

    I was hospitalized with blood clots a few years back. This was determined after testing:
    One copy of each of the MTHFR gene mutations tested, c.665C>T and
    c.1286A>C, was detected.

    I cannot find anything about c.665C>T and c.1286A>C. Can you direct me to where I can get more information and what this means?

    Thank you!

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