Hydrogenated Styrene/Isoprene Copolymer Bon Émulsifiant No known benefits Hydrogenated Styrene/Isoprene Copolymer at a glance Synthetic polymer Film-forming, opacifying, and viscosity-controlling agent Also an emulsifier Ruled safe as used in cosmetics Usage levels range from 0.89-4.2% Hydrogenated Styrene/Isoprene Copolymer description Hydrogenated styrene-isoprene copolymer is a synthetic polymer that serves multiple functions in cosmetics, among them as a film-forming, opacifying, viscosity-controlling and emulsifying agent. It adds water-repelling and also helps suspend other ingredients in gel and clear formulas. Known for its large molecule size, studies have shown hydrogenated styrene-isoprene copolymer is not likely to penetrate skin’s upper layers. The independent Cosmetics Ingredient Panel has ruled it is safe as currently applied in cosmetics, where usage levels typically range from 0.89–4.2% Related ingredients: Polymer