Hydrogenated Polyisobutene Good Emollient Hydration Hydrogenated Polyisobutene at a glance Synthetic emollient that provides moisture retention Acts as a lubricant on skin’s surface Often used as a replacement for mineral oil or silicones in a formula Deemed safe as used in cosmetics Hydrogenated Polyisobutene description Hydrogenated polyisobutene is a synthetic, relatively viscous emollient with research backing its ability to provide long-lasting moisture retention. It acts as a lubricant on skin’s surface, providing a soft, smooth feel. In some formulas, hydrogenated polyisobutene is used as a substitute for mineral oil or silicones because of its similar action to help maintain skin’s moisture barrier and improve the feel of skin care products. The independent Cosmetic Ingredient Review Board found hydrogenated polyisobutene is safe as used in cosmetics, where it is generally found in amounts of 4% or less. Related ingredients: Polyisobutene