Sodium lactate is a natural humectant, which helps to retain moisture. It is the *sodium salt of natural Lactic Acid, produced through the fermentation of sugar, an AHA that occurs everywhere in nature and is a natural moisturizing factor constituent of skin. Sodium Lactate is a superior moisturizer, increasing the moisture content of skin by up to 90%. When compared to other commonly used moisturizers, it’s water holding capacity is second only to Sodium Hyaluronate (Hyaluronic Acid).
When used in soap, sodium lactate also adds a firmness to the soap while adding its humectant properties to the soap as it is commonly known that even regular table salt gives soap extra firmness to an otherwise softer bar. Sodium lactate is a lovely natural additive to soaps and lotions and often overlooked in lotion making.
*Taken from Ingredients to Die For.