Ceramides are skin moisturizing and conditioning agents. Ceramides are lipid molecules that are found in the cell membranes. In the top layer of the skin, ceramides hold skin cells together, forming a protective layer that encourages moisture retention. In skin care products, ceramides are used to replenish the natural lipids that are lost from exposure to harsh environmental factors and products that dry out the skin. They restore moisture, fortify the skin’s natural barrier and help protect it.