Common mistakes around MTHFR Check

MTHFR checks in consumer DNA tests are common, but interpretation is often flawed. Common mistakes: 1) Assuming an MTHFR variant automatically causes serious health issues – most carriers are asymptomatic. 2) Uncritically taking high-dose folic acid or methylfolate without measuring homocysteine levels first. 3) Confusing risk with diagnosis: MTHFR polymorphisms (e.g., C677T) are risk factors, not disease causes. 4) Ignoring other genes (MTR, MTRR, CBS) and environmental factors (diet, B-vitamins). Evidence is mixed: there is moderate evidence for elevated homocysteine in certain variants, but the benefit of supplementation without lab values is unclear. Safety note: High folic acid doses can mask vitamin B12 deficiency. Consult a physician before taking supplements based on a genetic test.