Buxus chinensis. Widely used in cosmetics, it is the oil extracted from the bean-like seeds of the desert shrub Simondsia chinensis. A liquid wax used as a lubricant and as a substitute for sperm oil, carnauba wax and beeswax. Mexican and American Indians have long used the bean’s oily wax as a hair conditioner and skin lubricant. U.S. companies are now promoting the ingredient in shampoos, moisturizers, sunscreens and conditioners as a treatment for “crow’s feet,” wrinkles, stretch marks and dry skin.. On the basis of available information, the CIR Expert Panel concludes that it is safe as a cosmetic ingredient.