How does my DNA influence MTHFR activity?

Phase I (CYP450 enzymes), Phase II (sulfation, glucuronidation, methylation), and Phase III (transport): the three-act process by which your body neutralizes everything from caffeine to alcohol to environmental compounds. Genetic variants in any phase shift the kinetics, and the bottleneck moves accordingly.

What kind of test do I need to see my MTHFR Activity result?

Whole-genome sequencing at 30× clinical depth. Consumer SNP-chip tests like 23andMe or AncestryDNA only read ~0.02% of your DNA and miss most of the variants this analysis needs. Mosaic reads all 3 billion base pairs and produces the full report, all 108 insights.

How is MTHFR Activity different from clinical lab testing?

Clinical labs measure downstream biomarkers (blood levels, hormone values, metabolic byproducts) at a single point in time. Genomic insights like MTHFR Activity reveal the underlying variant that shapes the biology, which is constant for life. The two are complementary: labs show the current snapshot; genomics shows the long-term tendency and where lifestyle leverage is highest.

MTHFR Activity

One of 108 insights in your Genomic Lifestyle Optimization Report.

MTHFR converts synthetic folic acid into the active methylfolate your body uses. Reduced function is common, affecting up to 40% of people. If you're one of them, standard folic acid may not do much for you. Methylfolate is the form worth asking about.

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How your DNA shapes MTHFR activity.

MTHFR is the enzyme that converts folate from your food into the active form (5-methyltetrahydrofolate) your body uses for methylation, the process that builds neurotransmitters, regulates DNA expression, and clears homocysteine. It sits at one of the most consequential nodes in the methylation cycle.

C677T and A1298C are the two variants most people have heard of, and they often show up together. Carriers of one C677T copy are associated with enzyme activity around 65% of typical. Two copies, around 30%. The A1298C variant shifts the picture again, and the surrounding methylation-cycle genes (MTR, MTRR, BHMT, COMT, CBS) all interact with what MTHFR can do.

Methylated folate (5-MTHF) bypasses the conversion step entirely. So does folate-rich food: leafy greens, asparagus, beans. Synthetic folic acid, the form added to fortified flour, is the form the enzyme has to work hardest to process. Alcohol depletes folate. B12 status matters because the cycle stalls without it.

The reason your aunt swears by methylfolate and your friend says regular folic acid works fine isn’t preference. It’s biochemistry. Knowing which version of MTHFR you carry, and which related variants came along for the ride, changes what you’d actually want on your plate, and what to ask your provider about.

In your report, MTHFR Activity is one dark card: a color marker set by your variants, the mechanism in plain language, and one practical next step.

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Phase II: the 5-insight cluster.

MTHFR Activity is one finding in a tightly related cluster. Mosaic reads the other 4 alongside it, so you see the whole biology, not an isolated data point.

About MTHFR Activity.

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This is one of 108. Your report reads all of them, from one cheek swab.

See the real pages first. Then order your kit and the full Lifestyle Report lands in 15 to 20 days.

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