Evidence check: Leaky Gut Test in the context of sleep

A 'Leaky Gut Test' is often marketed as a biomarker for intestinal permeability, but the scientific evidence for its clinical utility is limited—especially in the context of sleep. While plausible mechanisms exist (e.g., gut-derived inflammation affecting sleep via the gut-brain axis), direct human studies linking a leaky gut test to improved sleep quality or duration are lacking. Most available data are mechanistic or associative (e.g., elevated zonulin in sleep disorders). A commercial test alone does not provide clinically actionable information for sleep issues. Established sleep screenings (e.g., PSQI, actigraphy) and a holistic approach to diet, stress, and microbiome are more evidence-based. The evidence for using a leaky gut test in sleep contexts is rated as 'unclear'.