La Roche-Posay, France, contains a site with unique spring water that has been used to treat skin conditions since the days of Napoleon. La Roche-Posay's products are developed by dermatologists for use on the most sensitive and reactive skin. For this reason, a limited number of ingredients are used, all of which are known to be hypoallergenic. Each product is tested on the most sensitive skin types at the intensive skin care center of La Roche-Posay and in dermatological hospital units. A panel of dermatologists tests each product in order to confirm the comfort improvement of the patients being treated. These products are pleasant to use, even on the most sensitive or reactive skin.