Intolerant skin is the most sensitive skin. It is hyper-reactive to many ingredients commonly used in skincare. The principal causes of such reactions are preservatives, fragrances, cleansers with added soaps, emulsifiers, resins and lanolin. The Toleriane line contains gentle formulas with a minimum amount of ingredients. All of the products are free of fragrance, preservatives, alcohol and parabens. This line of products by La Roche-Posay will calm even the most sensitive skin types. The three main ingredients to this line include Thermal Spring Water to calm soothe and strengthen the skin, Glycerin to absorb water from the air and deliver it to the skin and Squalane to help protect the skin from environmental aggressors.