Fatty Acids

Free fatty acids are a normal part of the lipid matrix in the stratum corneum, where they work with ceramides and cholesterol to support barrier organization and reduce water loss. Skincare formulas may contain fatty acids directly or include plant oils rich in specific fatty acids.

Linoleic acid is often highlighted in barrier-focused formulas, but fatty acids such as oleic, stearic and palmitic acid can also appear for emollience, texture or structural roles. Their effect depends on the type of fatty acid and the finished formulation.