← Genes & pathways

Gene & pathway reference · FROM DR. PURSER’S TEACHING

MTRR

Helps maintain the activity of methionine synthase, connecting B12-related chemistry with homocysteine metabolism.

Based on teaching by Dan Purser, MD. How we prepare these guides

Updated Sep 23, 2026 · Educational reference

THE TEACHING CONNECTION

Keeping the remethylation system working

Keeping the remethylation system working

Dr. Purser teaches MTRR alongside MTR because the pathway depends on maintaining an active B12-dependent enzyme system, not simply consuming a nutrient once. MTR performs the homocysteine-to-methionine reaction; MTRR supports reactivation of that machinery.

Putting the pieces together

Look at your B12 form, any B-complex you take, homocysteine and past response together. A gene result does not measure how much B12 is available in your tissues.

Where the VARS Triad and MTHFR Daily fit

If you are exploring homocysteine or cytokines, Dr. Purser may discuss MTHFR Daily and the VARS Triad: VARS Glutathione, VARS SOD, and VARS Catalase. He gives glutathione a central place in his approach to antioxidant support.

A gene result alone cannot tell you that you need these products or that they will treat a condition. Review your current results, medicines, goals, and tolerance with your clinician before choosing a product or dose.

A question to bring to your visit

Which current findings show whether this pathway needs attention now, and are several products duplicating B12 or folate?

Reading your own results

Bring your original report, current results, health history, and medicines to your visit. This information can help you ask questions, but it cannot diagnose a condition or choose a supplement dose for you.

Variant lookup

These names can help you find an entry on your original genetic report. Seeing a name here does not tell you whether it affects your health or whether you need treatment.

Names you may see

Methionine Synthase Reductase