Derived from the natural fermentation of sugars found in corn and beets, sodium lactate is the sodium salt of lactic acid. Naturally a liquid product, sodium lactate is also available in powder form. Sodium lactate is commonly used in food products as a preservative. It’s also an extremely effective humectant, helping to strengthen the skin moisture barrier.
The usage rate for sodium lactate is 1-3% , roughly 15g per 700g of oils. Simply measure out the sodium lactate, and stir into the cool lye water. Be careful not to use too much; using too much sodium lactate will result in a hard, crumbly bar of soap.
Sodium lactate can also be used in lotions to create a thicker, more hydrating product. Sodium lactate is used to create a creamier texture. The humectant properties of sodium lactate keeps skin moisturized longer.
In addition to hydration, sodium lactate cuts down on the stickiness sometimes found in lotion with a high glycerin content. In lotion recipes, a little sodium lactate goes a long way. Typically, the sodium lactate is used at 1-3% of the total lotion recipe.