Sodium lactate is a natural constituent of the uppermost layer of skin as a part of the NMF (Natural Moisturizing Factor). In cosmetics and personal care products, sodium lactate functions as a preservative enhancer, buffering agent, and humectant moisturizer. This means that it stops bacteria from reproducing, it will help establish and hold the pH of a product and as a humectant, it helps keep the skin hydrated.
