CERAMIDE NP (previously CERAMIDE 3) is a naturally occurring lipid and major component of the stratum corneum (outer skin layer). Levels of CERAMIDE NP decrease with advancing age. CERAMIDE NP is widely used as a moisturizer in cosmetic products because of its hydrating function. Interactions have been found with ceramide 1, synergistically improving the skin barrier function in humans, i.e. better skin hydration and less transepidermal water loss. There are no safety concerns for cosmetic products containing less than 1% CERAMIDE NP.