What role does CLOCK play in Haut?

The question about the role of CLOCK in skin is scientifically interesting but often overstated in consumer DNA tests. CLOCK (Circadian Locomotor Output Cycles Kaput) is a core circadian rhythm gene. This rhythm influences many skin functions: cell proliferation, collagen synthesis, sebum production, and barrier repair are time-dependent. Disrupted rhythms (e.g., shift work) can accelerate skin aging and inflammation. However, a single CLOCK SNP (like rs1801260) has only a small effect on individual skin health. Most consumer tests lack robust evidence linking specific CLOCK variants to skin outcomes. The evidence is primarily mechanistic (cell/animal studies) or from small human studies, not large-scale replication. Therefore, while circadian biology is relevant for skin, personalized advice based solely on CLOCK genotyping is premature. Focus on sleep hygiene and consistent light/dark cycles instead.