Evidence check: CLOCK in the context of Fruchtbarkeit

CLOCK gene variants (e.g., rs1801260) are linked to circadian rhythms, and some studies suggest they may influence fertility through menstrual cycle regulation or embryo implantation. However, the effects are small and not clinically predictive. Most evidence comes from GWAS or candidate gene studies, not interventional trials. A consumer DNA test for CLOCK in the context of fertility lacks robust support. Lifestyle factors such as sleep, diet, and stress management have a far greater impact. Therefore, any claim that a CLOCK test can meaningfully guide fertility optimization is overstated. Evidence: mechanistic/GWAS, not strong.