Myristyl Alcohol

Myristyl alcohol is a long-chain fatty alcohol used as an emollient/thickener (often ~0.5–5%) and is generally less irritating than short-chain alcohols, but it is not universally “non-irritating.” In patch testing and real-world use, fatty alcohols can trigger irritant or eczema flares in a reactive minority—especially on compromised skin—so I rate it as mild risk rather than inherently gentle. Safety Notes: In commercial skincare and haircare, myristyl alcohol is commonly used at very low levels (~0.05–0.5%) as a co-emollient/viscosity builder in lotions, cleansers, and conditioners, especially when paired with other fatty alcohols. Higher levels (5–15%) are seen in richer creams, balms, and conditioning products as part of the fatty-alcohol structuring system; the upper end (~20–25%) occurs in anhydrous sticks/balms and high-wax/fatty-alcohol bases sold OTC where myristyl alcohol functions as a primary structurant and slip agent. No specific EU/FDA concentration cap applies for this cosmetic ingredient; practical limits are driven by texture, melting profile, and compatibility (leave-on products tend to use higher levels than rinse-off).