Can LCT help with Haut?

The question whether the LCT gene (lactase persistence) can help with skin health lacks solid scientific evidence. LCT determines lactase production; deficiency causes lactose intolerance with gastrointestinal symptoms. A direct link to skin conditions like acne or eczema is sometimes discussed via the gut-skin axis, but human studies are scarce and inconclusive. The provided context contains no data on LCT and skin. Mechanistically, undigested lactose might alter gut microbiota and promote inflammation that could affect skin, but this remains hypothetical. Direct evidence from controlled trials is absent. Consumer DNA tests reporting LCT variants do not provide validated information about skin health. Evidence grade: unclear/mechanistic. Caution: marketing claims linking lactose intolerance to skin issues are not supported by strong evidence.