Naturally occuring lipids at the epidermis level.
Ceramides are necessary for water retention in the skin (hydration), for epidermal cell cohesion and their regulation1. Ceramides enhance the skin’s barrier function. Vichy Nutrilogie 1 and 2, Marcelle “New Age” Cleanser and Anti-Wrinkle day care. Skin Pharmacology and Applied Skin Physiology, September-October 2001, pages 261–271.