Myths vs facts: FOXO3 and Fruchtbarkeit

The claim that a specific FOXO3 variant directly impacts fertility is not well-supported by current evidence. FOXO3 is primarily known for its role in longevity and cellular stress resistance. Some studies suggest a possible link to ovarian reserve and age at menopause, but effect sizes are small and findings inconsistent. Most evidence comes from animal models or GWAS associations, not from human interventional trials. Consumer DNA tests that market FOXO3 as a 'fertility gene' overstate the science. Fertility is multifactorial—age, hormones, lifestyle, and environment play major roles. A single SNP has minimal predictive value. Therefore, it is a myth that FOXO3 testing provides meaningful fertility insights. Evidence level: unclear/mechanistic.