Myths vs facts: Leaky Gut Test and Haut

The concept of a 'leaky gut test' (often measuring zonulin or lactulose/mannitol ratio) as a direct indicator of skin issues like acne, rosacea, or eczema is not supported by strong clinical evidence. 'Leaky gut' is not a recognized medical diagnosis; it is a theoretical construct. Home tests for intestinal permeability lack validation for skin conditions. While some research suggests a link between gut barrier dysfunction and inflammatory skin diseases (e.g., psoriasis), the evidence is preliminary and mostly from animal models or small human studies. Consumer tests cannot reliably diagnose or guide treatment for skin problems. Relying on such tests may lead to unnecessary dietary restrictions or supplement costs without proven benefit. For skin concerns, consult a dermatologist. The evidence for a direct causal role of leaky gut in common skin conditions remains weak and mixed.