Rich in Selenium and oligo-elements, La Roche-Posay Thermal Spring Water has scientifically demonstrated soothing and protective properties. Promotes good skin health by reducing skin irritation. Its unique benefits make it an essential active ingredient in our products. Thermal spring water from the N°1 thermal dermatology center in Europe: it has treated over 450,000 patients for their skin conditions since its creation in 1905. The water has natural prebiotic properties: it rebalances the skin’s microbiome to reinforce the skin.