Capryloyl Glycerin/Sebacic Acid Copolymer

Capryloyl Glycerin/Sebacic Acid Copolymer is a synthetic polymer formed from capryloyl glycerin and sebacic acid. It belongs to a class of ingredients designed to form a continuous film on the skin surface, similar to how some silicones work, but with a different chemical structure.This ingredient functions primarily as a conditioning and protective agent. It deposits a thin, flexible layer on the skin that can help trap moisture and create a barrier against environmental stressors. It's used in relatively small concentrations across skincare formulations.

The polymer works by depositing a thin, continuous film across the skin surface. This film is flexible rather than rigid, meaning it won't crack or feel heavy when the skin moves or flexes. The film sits primarily on the outermost layers of skin, rather than penetrating deeply.By sitting on the surface, it reduces transepidermal water loss (TEWL) — the evaporation of moisture from skin — which helps maintain hydration. The conditioning properties also smooth the skin's surface texture, contributing to a softer feel.

This ingredient is most effective when used as part of a complete skincare routine. It works best in creams, serums and leave-on products where it can remain on the skin long enough to form a protective layer. There is no specific limit to how often you can use products containing this polymer — daily use is generally appropriate — though individual tolerance should always guide your routine.

This ingredient is well-tolerated by most skin types and has a long safety history in cosmetics. Sensitivity is rare, though those with very reactive skin may wish to patch-test first.