Antioxidant-containingcompositions and methods forconfirm-ing antioxidant activity of a compositionformulated for topical application to skin.Methods for testing a composition forability to inhibit both ultravioletradia-tion-induced lipid peroxidation on skinand ultraviolet radiation-induced reactiveoxygen species formation in the stratumcorneum. Compositions and methods fortreating and preventing photodamage toskin.