What role does MTHFR play in gut health?

MTHFR (methylenetetrahydrofolate reductase) is a key enzyme in folate and homocysteine metabolism. Its direct role in gut health is not well established. Some studies suggest that MTHFR variants (e.g., C677T) may indirectly affect gut barrier function and microbiome composition via altered methylation and elevated homocysteine, but a clear causal link is lacking. Consumer DNA tests often list MTHFR as relevant, but the clinical utility is limited. Evidence comes mostly from association (GWAS) and mechanistic studies, not robust clinical trials. For improving gut health, focus on diet, fiber, and lifestyle rather than a single gene variant. Caveat: MTHFR results are frequently overinterpreted; consult a healthcare professional for personalized advice.