What role does Kefir Darm play in Haut?

The role of kefir in skin health cannot be directly answered from the provided context. The given excerpts focus on DNA testing, nutrient reference values (fiber), and general nutrigenetics, but contain no specific information on kefir or its effects on skin. Generally, kefir is a fermented dairy product rich in probiotics, which may theoretically support skin health via the gut–skin axis – for example, in acne or inflammation. However, the evidence is mostly mechanistic or from small studies; large randomized controlled trials with clear skin endpoints are lacking. Without concrete evidence from the provided material, the evidence level must be considered unclear. Consumers should not overestimate such effects and should consult a dermatologist for skin concerns.