What to watch with Folsäure and Sport?

When combining folic acid (folate) and exercise, key considerations include individual genetic variants (e.g., MTHFR), potential masking of B12 deficiency, and increased folate needs during intense training. Folic acid is crucial for DNA synthesis and red blood cell production, which are important for athletic performance and recovery. However, supplementation is not automatically beneficial. People with MTHFR variants (e.g., rs1801133) may have reduced ability to convert synthetic folic acid into its active form (5-MTHF); in such cases, methylfolate may be more effective. High-dose folic acid (>1 mg/day) can mask a vitamin B12 deficiency, which is especially relevant for athletes on plant-based diets or with absorption issues. Some studies suggest that strenuous exercise increases folate turnover, potentially raising requirements. A balanced diet rich in leafy greens, legumes, and fortified foods usually meets needs. Before supplementing, check blood levels of folate, B12, and homocysteine. Evidence: human-moderate (MTHFR, B12 masking) and mechanistic (exercise-related folate metabolism). Caveat: No universal recommendation; individual assessment is key.