octisalate

Octisalate, also known as octyl salicylate, is an organic compound used in cosmetics and sun protection products. It acts as a UV filter by absorbing ultraviolet radiation in the UVB range and is commonly included in sunscreen formulations to help provide SPF alongside other filters. In addition to its role as a UV filter, octisalate serves as an emollient and solvent in cosmetic formulations due to its lipophilic character.

Chemically, octisalate is the ester of salicylic acid and octanol. It is a clear, oily liquid that blends well with typical cosmetic bases. It has a relatively low polarity and is soluble in oils and many organic solvents. Its UV absorption is primarily in the UVB region (approximately 290–320 nm), contributing to skin protection from sunburn. It provides little to no additional protection in the UVA range (320–400 nm), so products typically combine octisalate with UVA filters for broader spectrum.

Regulatory status varies by jurisdiction. In many countries it is an approved cosmetic UV filter, often used at low concentrations in finished products. Safety evaluations have generally found octisalate to be well tolerated in standard use, though, as with other filters, rare skin irritation or sensitization can occur in sensitive individuals.