Can B12 help with Fruchtbarkeit?

Whether vitamin B12 can improve fertility is not clearly answered by the provided context, which lacks direct studies on B12 and reproduction. B12 is essential for cell division, DNA synthesis, and homocysteine metabolism—all processes relevant to fertility. Severe deficiency can impair ovulation, sperm quality, and increase miscarriage risk, especially in vegans or those with malabsorption. However, robust randomized controlled trials showing that B12 supplementation enhances fertility in people with normal levels are lacking. Evidence is mostly observational or mechanistic. Consumer DNA or microbiome tests (e.g., from MyBody-X) may flag genetic variants (MTHFR, MTRR) or gut bacteria that affect B12 utilization, but these tests are not clinically validated and often rely on marketing claims. Measuring blood B12 levels is prudent before supplementing. High doses are water-soluble and generally safe, but without deficiency, a fertility benefit is unproven. In summary, B12 is necessary but not a standalone solution. For couples struggling with infertility, a comprehensive medical workup is essential.