When is MTHFR Genetik actually useful?

MTHFR genetic testing is useful only in limited clinical scenarios. The common variants (C677T, A1298C) affect folate metabolism, but evidence for everyday utility is weak. Testing can be helpful when elevated homocysteine is present (e.g., recurrent thrombosis, miscarriage, or cardiovascular risk) – then knowing the genotype can guide supplementation with active folate (methylfolate) instead of folic acid. It may also be considered in cases of intolerance or poor response to standard folic acid. However, most people with MTHFR variants have no health issues. Direct-to-consumer tests often overstate risks. Evidence for benefits in 'methylation disorders', fatigue, or 'detoxification' is weak to absent. A genetic test does not replace blood work (homocysteine, vitamin levels). Bottom line: Only useful in specific clinical contexts with elevated homocysteine or treatment resistance – not as a general health screen.