The Obagi Nu-Derm Physical UV Block SPF 32 is a very powerful and effective sunscreen lotion to help protect the skin against harmful environmental free radicals and sunrays. The Physical UV Block contains an astonishing 18.5% Zinc Oxide for the best protection against harmful UVA/UVB sun rays that can cause premature aging, fine lines and wrinkles, sun spots and other skin damage. Physical UV Block SPF 32 does not contain any chemicals, for a non-irritating application that can be used on any and all skin types. Physical UV Block SPF 32 is not a heavy, absorbs well, and will leave the skin feeling silky and smooth.