Evidence check: Folsäure in the context of Haut

Folic acid (vitamin B9) is crucial for cell division and skin renewal. The provided context does not directly address skin, but includes general folate metabolism (MTHFR 677T, PMID 26497154). Observational studies suggest folic acid may support UV protection and wound healing, but the evidence is moderate and insufficient for specific skin recommendations. High doses (>1000 mcg/day) should be avoided, especially with MTHFR variants. For skin concerns, consult a doctor. Genetic testing for MTHFR provides only partial insight; environmental and dietary factors are more influential.