Evidence check: CLOCK in the context of longevity

The CLOCK gene is a core component of the circadian rhythm machinery, regulating sleep-wake cycles, metabolism, and inflammation. Some GWAS have linked CLOCK variants to metabolic traits and, tentatively, to longevity in certain populations. However, the evidence is primarily mechanistic and observational; effect sizes are small and not clinically actionable. A single CLOCK SNP from a consumer DNA test cannot predict lifespan or guide specific interventions. Lifestyle factors such as consistent sleep, balanced nutrition, and physical activity have far greater impact on healthspan. No supplement (e.g., melatonin, NAD+ precursors) is proven to modify CLOCK-related longevity risk. The findings are best considered as part of a broader picture, not as standalone predictors. Evidence level: gwas/mechanistic. Caveat: no direct clinical recommendations from this SNP alone.