Can MTHFR help with Müdigkeit?

Can MTHFR help with fatigue? The answer is nuanced. MTHFR is a gene encoding an enzyme that converts dietary folate into its active form (5-methyltetrahydrofolate), crucial for methylation and homocysteine metabolism. Variants like C677T can reduce enzyme activity, potentially raising homocysteine levels, which have been linked to fatigue, cognitive issues, and cardiovascular risk in some observational studies. However, the evidence for a direct causal role in fatigue is weak and mixed. Many carriers of MTHFR variants are asymptomatic, and lifestyle factors (diet, stress, sleep) plus other genetic and environmental influences dominate. Direct-to-consumer genetic tests often overstate the impact. While supplementing with active folate (5-MTHF) may benefit those with a proven deficiency or elevated homocysteine, routine testing for fatigue is not supported by strong evidence. A comprehensive medical workup is essential. In summary, MTHFR testing can offer a piece of the puzzle but is not a standalone solution for fatigue.