C12-18 Alkanoyl Glycerin/Sebacic Acid Copolymer

C12-18 Alkanoyl Glycerin/Sebacic Acid Copolymer is a synthetic polymer created by combining fatty acids (derived from a chain of 12-18 carbon atoms) with sebacic acid and glycerin. It functions primarily as a conditioning and film-forming agent in skincare formulations.This ingredient is designed to coat the skin and hair, creating a smooth texture and enhancing the sensory feel of a product. It helps stabilise emulsions and improve the overall spreadability of creams and serums.

This copolymer works by forming a thin, invisible film across the skin's surface. The glycerin component is hydrophilic (water-loving), while the fatty acid chains are lipophilic (fat-loving), allowing the molecule to integrate with both the aqueous and oily phases of a formulation.Once applied, the polymer sits on the skin as a conditioning layer, contributing to smoothness and helping to seal in moisture. It also plays a functional role within the formula itself, acting as a binder and thickener to improve texture and application.

This ingredient is typically encountered in finished products rather than as a standalone treatment. Use products containing this polymer as directed on the packaging. If you have fungal acne or are prone to yeast-related breakouts, patch test first and monitor your skin's response. There is no need to use products containing this ingredient more or less frequently than the product instructions suggest.

Generally well-tolerated in cosmetic products. However, those with confirmed fungal acne or Malassezia sensitivity may wish to exercise caution, as this ingredient is sometimes listed as potentially problematic for this condition, though clinical evidence is limited.