Sodium lactate is found in the stratum corneum of the skin and is the most cost effective, naturally occurring humectant available for use as a moisturizer. Has slight skin-lightening effects. Useful to adjust pH. For bar soaps: hardens bar, reduces cracking, and increases moisture retention.
Lactic acid is a naturally occurring alpha hydroxy acids (or AHAs) produced by fermentation of sugars. Very useful to rejuvenate the skin by encouraging the shedding of old surface skin cells. Can reduce the appearance of fine lines, irregular pigmentation, age spots & decreases enlarged pores