Can Folsäure help with fertility?

Folic acid (vitamin B9) is essential for cell division and DNA synthesis. Deficiency can impair fertility, e.g., by disrupting ovulation or sperm quality. Supplementation is strongly recommended before and during pregnancy to prevent neural tube defects. Whether folic acid directly boosts fertility is less clear: some studies suggest benefits in women with certain MTHFR variants or in men with low levels, while others show no effect. Evidence is moderate. Caution: high doses (>1 mg/day) should only be taken under medical supervision, as they can mask vitamin B12 deficiency. Genetic testing for MTHFR is not recommended for the general population. Bottom line: folic acid is important for reproductive health but not a fertility cure-all. A balanced diet and medical guidance remain key.