Sometimes the simplest ingredients from nature are the most effective when it comes to treating common skin ailments. The La Roche Posay Thermal Spring was developed from pure thermal spring water from a small village in the central region of France. This water is particularly rich in beneficial minerals and is the secret behind the success of La Roche Posay Thermal Spring products. The water used is extremely pure and has a neutral pH level which is safest for the skin. La Roche Posay Thermal Spring water has an exceptionally high selenium concentration which delivers ultimate protection against cell damage and aging.