Photoprotection in the infrared radiation range.

The solar spectrum reaching the earth contains a portion of wavelengths corresponding to the infrared range. Along with ultraviolet radiation, infrared radiation contributes to the biological effects of sunlight on the skin. In recent years several sunscreens have appeared that claim to protect against infrared radiation. We have evaluated the immediate erythema induced by infrared radiation, and the protection offered by such sunscreen. We found it offered a minimal but real protective effect against infrared-induced erythema.