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How to Find Out if You Have an MTHFR Gene Variant

Genes Mentioned

Of all the genes in the world of nutrigenomics, MTHFR is probably the best known.

If you’re wondering whether you “have MTHFR,” you needn’t. Everyone has MTHFR genes, it’s just that some of us carry variants that reduce the function of the gene’s activity.

Because variants in the MTHFR genes are quite common, many in the genetics world, such as 23andme, recommend against testing for mutations at all.

While we agree that the “symptoms” blamed on changes in the MTHFR genes are wildly overstated in the functional health world, failing to test altogether is a mistake, especially for the Black community, where the clinically significant variants are far less common.

If you are wondering whether you carry common variants in the MTHFR genes called SNPs, there are a number of tests that report on these genes.

DNA test kits that include MTHFR variants

Below are the top 4 DNA test kits that test for MTHFR variants:

  1. Boston Heart Diagnostics
  2. 23andme
  3. Ancestry
  4. Gene Food

How to find MTHFR for 23andme users

If you have already purchased a 23andme test kit, you can login to see your MTHFR status by downloading your raw genetic data.

If you have a 23andme account, you can login and see your MTHFR status in a few simple steps.

Step #1 – login and select “browse raw data”

23andme has made it much easier to navigate to your raw data file from the dashboard of a logged in account. Find out MTHFR

Step #2 – search MTHFR

Once you arrive at the raw data screen, you can search genes by name and see your call for the various SNPs they report on.

There are many different MTHFR genes, although we will focus on a couple that are thought to be most clinically relevant. As you can see from the screen below, I typed in MTHFR directly into the 23andme search bar. MTHFR in 23andme interface

Step #3 – find the right version of the MTHFR gene

Once you arrive at the raw data search field for 23andme, you simply scroll down the page and find the relevant rsID of the MTHFR gene you’d like to evaluate.

You will see numerous results with your status for each under the “Your Genotype” column. searching 23andme for MTHFR genes The most researched MTHFR variants are MTHFR C677T (rs1801133) and MTHFR A1298C (rs1801131).

First, stop and notice how similar the rsID numbers are for these genes!

Next, scroll the “Marker / SNP” column and find these variants. Minor allele for A1298C is – C or G. Minor allele for C677T is – T or A.

If 23andme shows one copy of the minor allele that represents a “heterozygous” mutation. If two copies, that is a homozygous mutation. Here you can see Here, you can see my call for MTHFR C677T is G/G, meaning I do not carry a risk allele. MTHFR

Not sure what to eat?

Gene Food uses a proprietary algorithm to divide people into one of twenty diet types based on genetics. We score for fat metabolism, histamine clearance, carbohydrate tolerance, and more. Where do you fit?

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Other options

We have a blog post on our site detailing the various sites that process 23andme raw data.

Although it doesn’t weigh heavily in our analysis, MTHFR is also one of the genes we report on in the methylation section of our custom nutrition plans.

Dr. Aaron Gardner, BSc, MRes, PhD

Dr. Aaron Gardner, BSc, MRes, PhD is a life-scientist with a strong background in genetics and medical research, and the developing fields of personalized medicine and nutrition. Read his full bio here.

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  1. Tricia says:

    I had some test ran and it came back as Gene MTHFR Genotype C/C (C677T); A/C (A1298C)
    I am having a hard time finding out exactly what this means. Do I have two mutated Genotypes?
    My vitamin B12 is on the low side and I am currently getting weekly injections for four weeks and then will got to once a month, due to the fact that I tried to take sublingual form and it sent me into a heightened anxiety.

  2. Denise says:

    So, to clarify what does the +/- result mean?

    Does that mean you have the gene or that you are a carrier? My report came back for both and they were A/G and G/T

    • Eli, 23andme reports still show your MTHFR genotype in the raw data, you just need to pull the raw data and take it to a 3rd party provider, like Genetic Genie.

  3. Aubrey franklin says:

    My sister has both copies of the mthfr gene and I would like to know if I have the same mutations. I would like to order the 23 and me but I’m confused whether I should order the $99 version or the $199 version if I just need to raw data to find out about the mthfr genes. Please help!

  4. Rosemary says:

    Thanks for the article. I am homozygous for 1298C and have sent in my 23andme sample to find out any other SNPs I might need to know about.

    Do you know anyone in Austin who is good at interpreting 23andme genetic data? Any other sites through which it would be good to upload the data?


    • Rosemary, Livewello is a valuable platform for interpreting genetic data in our opinion. If you’re looking for help with nutritional advice, we can assist with that, if you’re looking for medical diagnostics, I don’t know of a place in Austin that I’d recommend. There are some functional medicine docs who claim to be able to interpret genetic data, but I think the medical community is a ways away from coherent and reliable analysis.

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