One of several types of ceramides, which are naturally occurring, long chains of lipids (fats) that are major components of skinŠ—Ès outer layers. Research shows moisturizers containing ceramide NP can improve the look and feel of dry skin.
References for this information:
Skin Pharmacology and Physiology, 2016, pages 135-147
Contact Dermatitis, June 2002, pages 331-338