Myristyl Myristate

Myristyl myristate is a fatty ester emollient/wax used to improve slip and texture, typically at a few percent up to ~10% in creams and makeup. It is not a common primary irritant or sensitizer in patch-testing data, but in very reactive or eczematous skin it can occasionally contribute to discomfort or follicular congestion when layered with other occlusive lipids. Given its generally good tolerability yet non-zero risk in compromised skin, a gentle (not inert) score is appropriate. Safety Notes: In commercial products, myristyl myristate is commonly used at very low levels (~0.05–1%) as a slip agent/structuring emollient in lotions, sunscreens, and makeup where it supports skin feel without strongly affecting viscosity. In richer leave-on creams, balms, pomades, and stick products it is used at much higher levels (typically 5–20%), and high-wax anhydrous sticks/balms and heavy emollient body products available OTC can reach about 25% as part of the lipid/structuring phase. It is not specifically concentration-restricted in major cosmetic regulations, with practical upper limits driven by texture, melting point, and potential for increased comedogenic feel in leave-on facial products.

Suitability