Photoprotection in the infrared radiation range.

Area of Science:

• Dermatology
• Photobiology
• Sunscreens

Background:

• Solar radiation includes infrared (IR) wavelengths, which, alongside ultraviolet (UV) radiation, impact skin biology.
• IR radiation is increasingly recognized for its contribution to sunlight's biological effects on the skin.
• Recent advancements include sunscreens claiming protection against IR radiation.

Purpose of the Study:

• To assess the immediate erythema response induced by infrared radiation.
• To evaluate the protective efficacy of commercially available sunscreens against IR-induced erythema.

Main Methods:

• Controlled experimental setup to induce erythema using infrared radiation.
• Application and testing of sunscreen formulations claiming IR protection.
• Quantification of immediate erythema as a measure of skin response.

Main Results:

• Infrared radiation was found to induce immediate erythema.
• The tested sunscreens demonstrated a minimal but statistically significant protective effect against IR-induced erythema.
• The protective effect, while real, was limited.

Conclusions:

• Sunscreen formulations can offer a degree of protection against the immediate erythema caused by infrared radiation.
• Further research is needed to develop more effective sunscreens against the full spectrum of solar radiation, including IR.
• Consumers seeking comprehensive sun protection may consider these newer formulations, understanding their current limitations.