Lactic acid can be used as a humectant

Since the Lactic acid  aturally present in the hair, is to make the hair shiny surface, so often used as hair care products of lactic acid pH adjusting agents;
lactic acid can be used as a humectant for a variety of bath wash supplies, such as private parts bath gel, bar soap and moisturizing honey. The liquid soap, shampoo and soap can be used as a pH adjusting agent. In addition, lactic acid added to the bar soap can reduce the loss of water during storage, thus preventing the soap dry.
Since buffered lactic acid is the skin's natural moisturizing factor inherent part of many skin care products are widely used as a moisturizing agent. L-lactic acid is the most effective one AHA and little irritation.