Photoinstability of UVA Sun Protection Products

Thin films of leading commercial high-sun-protection-factor sun products with UVA (ultraviolet 340- to 380-nm radiation) claims were compared to a new, high-efficiency sunscreen product that was designed to resist breakdown from exposure to UV radiation. The relationship between the thickness of the topical application of sunscreen films and the durability and efficacy of the product has significant clinical implications for physicians.