Lecithins

Lecithins are natural components of the skin's natural cell membrane in animals and plants and are among the most valuable commodities dermatologically in natural cosmetics. They are active, nourishing and moisturizing skin lipids and emulsifiers at the same time. They are moisturizing and smoothing, promote the absorption of active ingredients into the skin and regulate keratinization disorders. Lecithins may occur as unsaponifiable component of natural oils or as an isolated lecithin product in cosmetics.

see Heike Käser 2010 "Natural Cosmetic Raw Materials", Linz, Freya Verlag, 3rd Edition 2012