Natural ingredients, such as extracts from plants or animals, have been used in skin care for thousands of years. Cleopatra, for example, appreciated bathing in donkey’s milk as it nurtures the skin; the major nourishing components in milk are proteins, sugars, fatty acids, vitamins and minerals. Modern developments in skin care use various amino acids, peptides or proteins and their hydrolysates, either from plant or animal sources, as active ingredients in cosmetic formulations.
Nowadays proteins are widely used in cosmetics providing beneficial effects for skin, hair and beauty. Silk is one of these: a natural protein which is used in personal care products mainly in its hydrolysed form. Hydrolysed silk proteins are a common ingredient, especially in hair care products. This article will present two silk ingredients containing fully functional – not hydrolysed – silk and discuss their efficacy[1,2,3,4].