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"I have the COMT variant, and taking too many methylated supplements can ramp up anxiety. I was able to find a version of B12 that works well for those with both variants."

— Michael | PlexusDx Longevity & Healthy Aging Genetic Test | March 2026

Product: Longevity & Healthy Aging Genetic Test  |  Health Focus: Methylation & Longevity  |  PlexusDx Customer Since: 2026

The Challenge

Michael wasn't starting from zero. He already knew from prior testing that he carries the MTHFR variant, and he had built his supplement routine accordingly — taking methylated B12 and methylated folate to support his methylation pathway. The problem was that his protocol was built on half the picture. What he didn't know was that a second variant was complicating everything he thought he had dialed in.

What the Test Revealed

Michael's PlexusDx Longevity & Healthy Aging Genetic Test confirmed his known MTHFR variant — but also surfaced something his previous testing had missed: a COMT variant. COMT (Catechol-O-Methyltransferase) is the gene responsible for breaking down catecholamines and clearing methyl groups from the body. When COMT function is reduced, excess methylation can accumulate — and for someone already supplementing heavily with methylated B vitamins for MTHFR, this combination creates a direct conflict. Too many methyl donors can overwhelm a slow COMT pathway, with anxiety as one of the potential downstream effects. Michael's PlexusDx consultation was key — it helped him understand how to prioritize his results and navigate recommendations that initially appeared to contradict each other.

What Changed

Armed with the full picture, Michael made precise adjustments to his supplement protocol:

  • Switched from standard methylated B12 to Adenosyl/Hydroxy B12 — a form of B12 that supports both MTHFR and COMT variants without contributing to over-methylation
  • Added slow-release niacin as a methyl buffer to help manage excess methylation from his existing protocol
  • Used his PlexusDx consultation to establish a clear priority order for addressing potentially conflicting genetic recommendations

The Outcome

Michael's protocol adjustments are recent — by his own account, it's too early to report measurable physical changes. But the outcome that matters most at this stage is already in place: clarity. For years, his supplement strategy was built on a single known variant. PlexusDx revealed the second piece — COMT — that explained why a well-intentioned methylation protocol can create new problems. He now has a complete, conflict-aware genetic picture and a specific supplement solution designed for both variants simultaneously. That foundation is the result.

In His Own Words

"After having my consultation, I can provide more information on my experience. The appointment was quite valuable in terms of how to prioritize some of the results and how to deal with potentially conflicting recommendations. As far as changes I've already implemented, I have adjusted a few of my supplements. I've known that I have the MTHFR variant from previous testing, so I've been taking methylated B12 and methylated folate. These results showed also that I have the COMT variant, and taking too many methylated supplements can ramp up anxiety. I was able to find a version of B12 (Adenosyl/Hydroxy B12) that, it appears, works well for those with both variants. I've also added a slow release niacin which I've read can help with over methylation."

— Michael, PlexusDx Customer | March 2026

Results reflect Michael's personal experience with PlexusDx genetic testing. Individual results will vary. PlexusDx genetic tests are not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before making changes to your supplement or nutrition regimen.

Ready to understand how your full genetic picture — including interactions between variants — shapes your health strategy? Explore the Longevity & Healthy Aging Genetic Test →

Frequently Asked Questions

What is the COMT variant and how does it interact with MTHFR?

COMT (Catechol-O-Methyltransferase) is a gene that regulates how your body breaks down and clears methyl groups, stress hormones, and certain neurotransmitters. When someone carries both a MTHFR variant and a COMT variant, there is a direct tension: MTHFR impairs methylation production, while COMT impairs methylation clearance. Supplementing aggressively with methyl donors to address MTHFR can overwhelm a slow COMT pathway — potentially contributing to over-methylation symptoms like anxiety or irritability. Knowing both variants simultaneously is essential for building a supplement protocol that addresses one without worsening the other.

Can taking too many methylated supplements be harmful?

For individuals with a COMT variant, yes — excess methyl donors can accumulate faster than the body can clear them, a condition known as over-methylation. Symptoms can include anxiety, irritability, insomnia, and elevated heart rate. This is why standard MTHFR supplement advice — which typically recommends methylated B12 and methylated folate — does not apply uniformly to everyone. A genetic test that identifies both MTHFR and COMT variants, like the PlexusDx Longevity & Healthy Aging Genetic Test, gives you the complete picture needed to calibrate your methylation support safely.

What is Adenosyl/Hydroxy B12 and who should consider it?

Adenosyl/Hydroxy B12 is a non-methylated form of vitamin B12 that provides the cofactor support needed by MTHFR variant carriers without adding methyl groups to an already burdened COMT pathway. Unlike methylcobalamin — the most commonly recommended B12 for MTHFR — adenosylcobalamin and hydroxocobalamin do not contribute to methyl load, making them a more appropriate choice for individuals who carry both MTHFR and COMT variants. If you have received conflicting supplement guidance or suspect your current B12 protocol may be contributing to over-methylation symptoms, discussing your full genetic variant profile with a knowledgeable practitioner is a valuable next step.