Cetearyl Alcohol (a defined blend of cetyl [C16] and stearyl [C18] fatty alcohols) is a waxy, high–melting, non-volatile primary alcohol used across modern skincare as an emollient, co-emulsifier, and rheology/texture builder. In emulsions, its long alkyl chains pack into lamellar domains that increase viscosity, reduce syneresis, and stabilize oil–water interfaces. For leave-on products, these lamellae deposit a soft, low-tack film that diminishes transepidermal water loss (TEWL) by improving the skin’s hydrolipidic continuity and by minimizing water evaporation through occlusion. Because it is not a short-chain “drying” alcohol, it is typically well tolerated, helps creams feel cushiony and uniform, and supports the sensory signature of barrier creams, rich moisturizers, and balms.

In hair and scalp care, this raw material is a pillar of conditioning systems. In rinse-off conditioners it co-structures with cationic surfactants (e.g., quats) or with anionics/amphoterics to create lamellar gel networks that drive viscosity, wet/dry slip, and the on-fiber deposition that reduces friction and static. In masks and leave-ins, its waxy network enhances body and combability without excessive greasiness when paired with light esters, silicones, or oils. The same structuring behavior enables solid formats (bars/sticks) and maintains clarity in rich but stable surfactant systems.