Is Leaky Gut Test useful for skin aging?

The usefulness of a 'Leaky Gut Test' (intestinal permeability test) for skin aging is not supported by current evidence. The concept of leaky gut remains controversial in mainstream medicine: there is no consensus on diagnostic criteria, no validated test for routine use, and no direct link to skin aging established in controlled human studies. Mechanistic hypotheses suggest that increased intestinal permeability could promote systemic inflammation and oxidative stress, potentially accelerating skin aging, but these are speculative. Commercial tests (e.g., zonulin, lactulose/mannitol) are often marketed with exaggerated claims and lack validation for skin-specific outcomes. Even if a test indicates increased permeability, it is unknown whether interventions (diet, probiotics) would improve skin aging. Therefore, such tests are not useful for this purpose and may lead to unnecessary expense or false reassurance. For skin aging, focus on proven factors: sun protection, balanced diet, sleep, and stress management. Consult a healthcare professional for personalized advice.