All CeraVe serums are formulated with three essential ceramides that are identical to those found naturally in your skin. Ceramides are a key component of your skin barrier, and they play a vital role in maintaining healthy-looking skin. Research shows that these lipids comprise up to 50% of your skin’s natural barrier.1,2 You can think of ceramides as the “glue” that holds your skin cells together to help seal in moisture and block out harmful substances. Developed with dermatologists, our gentle, fragrance-free products help maintain the skin’s protective barrier for hydrated, comfortable-feeling skin.