What it is
Sodium isostearoyl lactylate is the sodium salt of an ester formed from isostearic acid and lactic acid. It functions as an emulsifier that helps blend oil and water phases and can also condition the skin surface, contributing to a smooth, soft after-feel. It is found in moisturizers, color cosmetics, and sunscreens where it supports emulsion stability and a pleasant texture.
Safety & warnings
Lactylate emulsifiers such as sodium isostearoyl lactylate are generally well tolerated at the levels used in cosmetics and are not commonly associated with sensitization. It is not a recognized fragrance allergen.
Origin & sourcing
Synthetic. It is produced by esterifying isostearic acid with lactic acid and neutralizing with sodium.
Questions everyone asks
What role does sodium isostearoyl lactylate play?
It works mainly as an emulsifier to combine oil and water phases and can also condition the skin for a smooth feel.
Is it related to lactic acid?
Yes. It is an ester salt made in part from lactic acid combined with isostearic acid, but it functions as an emulsifier rather than an exfoliating acid.