Is CLOCK useful for gut health?

The CLOCK gene is a core component of the circadian clock and may indirectly influence gut health by regulating motility, nutrient absorption, and the gut microbiome. Circadian disruption (e.g., shift work) is linked to dysbiosis and increased intestinal permeability. However, direct evidence that specific CLOCK polymorphisms (e.g., rs1801260) are useful for improving gut health is weak. Most data come from animal or mechanistic studies; robust human trials are lacking. Therefore, a consumer DNA test for CLOCK variants is not clinically actionable for gut health. Lifestyle measures like consistent sleep-wake cycles and light exposure are more evidence-based. Evidence level: mechanistic.