Pharmaceutical intermediates: the main effect of lactose acid is beauty, often used to make masks. The action of lactose acid on the skin can reduce the cohesion between the somatic cells of the skin stratum corneum, accelerate the shedding of the stratum corneum cells, improve the metabolism of clinical epithelial cells, and promote the upgrading of the skin. In addition, lactose acid acts on the dermis, which can increase the moisture content of the skin, increase the ductility of the skin, and has a certain effect on removing wrinkles.