Is Leaky Gut Test useful for Darmgesundheit?

The scientific evidence for the usefulness of a 'leaky gut' test for gut health is weak. The concept of increased intestinal permeability is not a recognized medical diagnosis. Common tests such as stool zonulin or lactulose-mannitol urinary tests lack sufficient validation to reliably assess gut barrier function. Many commercial providers market these tests, but independent, controlled studies demonstrating clear benefit for the general population are missing. For actual digestive complaints (e.g., IBS, food intolerances), medically supervised approaches like elimination diets or specific IgE tests are better supported. A leaky gut test may serve as a supplementary clue but should not be the sole basis for dietary changes or supplementation. Caution is advised against unnecessary restrictions, especially in children.