Propylparaben, the n-propyl ester of p-hydroxybenzoic
acid, occurs as a natural substance found in many plants and some
insects, although it is manufactured synthetically for use in cosmetics,
pharmaceuticals and foods. It is a preservative typically found in many
water-based cosmetics, such as creams, lotions, shampoos and bath
products. As a food additive, it has the E number E216.