Evidence check: Leaky Gut Test in the context of Müdigkeit

The so-called 'leaky gut test' is often marketed as a solution for vague symptoms like fatigue. However, the scientific evidence is weak: the concept of a 'leaky gut' is not recognized as a distinct disease, and common tests (e.g., for zonulin or lactulose/mannitol) lack sufficient validation to causally link to fatigue. Fatigue has many potential causes – from sleep deprivation and iron deficiency to thyroid disorders. A positive test result does not necessarily explain your symptoms. Instead of expensive self-tests, I recommend a medical workup using established methods. The evidence for these tests is marketing-driven, not clinically robust.