Arachidyl Alcohol

Arachidyl alcohol is a long-chain fatty alcohol used mainly as an emollient/thickener (typically ~0.5–5%), and fatty alcohols of this type are generally well-tolerated with low inherent irritancy compared with short-chain alcohols. Clinical patch-test experience suggests irritation and true allergy are uncommon but not impossible, particularly in highly reactive or eczema-prone patients and in leave-on products with multiple barrier-stressing ingredients. Given the need to protect compromised skin while acknowledging rare reactivity, it fits a very gentle risk profile rather than fully inert. Safety Notes: Arachidyl Alcohol (a C20 fatty alcohol, often part of the arachidyl behenyl alcohol/glucoside lamellar system) appears at low levels (~0.05–0.3%) in emulsions where it functions as a minor co-structurant or slip/viscosity aid alongside other fatty alcohols. In consumer leave-on creams, balms, and barrier moisturizers using lamellar/emulsifier blends, combined fatty alcohol structuring can push arachidyl alcohol into the multi-percent range, with the highest OTC products observed around ~5–8% when used as a primary waxy thickener/structurant; rinse-off formats typically sit lower due to sensorial and deposition constraints. There is no specific EU/FDA concentration cap for this ingredient in cosmetics, so the upper end is mainly set by stability, texture, and consumer acceptability.