Lipid Drops For All Skin Types This pre-moisturizing serum replenishes skin with an invisible coating of sphingolipids and ceramides to trap in moisture and protect from environmental harm. Laboratory testing reveals an increase in skin moisturization sustained for 6 hours after a single application. After 14 days, skin smoothness increased by 55%, skin hydration increased by 47% and the appearance of fine lines decreased by 15%. Price: $56.07