Is LCT useful for Haut?

The question of whether the LCT gene (lactase persistence) is useful for skin (Haut) is not supported by current evidence. LCT encodes lactase, an enzyme that digests lactose in the small intestine. Variants like rs4988235 determine adult lactose tolerance but have no direct, well-established link to skin health, aging, or conditions such as acne or eczema. Some commercial DNA tests may suggest a connection, but this is based on weak or indirect associations, not robust clinical data. If you are concerned about your skin, consult a dermatologist rather than relying on a consumer genetic test for LCT. The evidence grade for using LCT in a skin context is 'marketing/unclear'.