Arachidic acid (eicosanoic acid) ek saturated long-chain fatty acid hai jo cosmetics mein mainly emollient, thickener aur opacifying agent ke taur par use hota hai. Yeh surfactants aur emulsifiers ke base ke liye bhi lagta hai. Isse formulation stable rehta hai aur skin conditioning improve hoti hai. Dry skin ke liye accha hai kyunki yeh moisture lock karta hai aur skin ko soft banata hai.