Lecithin

Origin/History:

Naturally occurring ingredient (e.g. Soy), contained in the human body, a basic component
Building block of cell membranes
Phospholipid

Functions/Science:

Emollient, soothing, smoothing, binds moisture, rehydrating, restoring
Emulsifier: Combines water and fats permanently
Facilitates the absorption of active ingredients by improving the skin penetration
In combination with vitamins C and E it supports the defense against free radicals and ensures an increased moisture content