The Definitive Guide to D-Panthenol: The Molecular Science of Deep Skin Hydration and Barrier Repair If you examine modern skincare ingredient labels, you will almost certainly spot panthenol. Known familiarly as provitamin B5, it is celebrated by dermatologists and cosmetic chemists alike as a cornerstone of calming, restorative skincare. Yet labeling D-panthenol as merely a soothing additive overlooks the remarkable molecular machinery it triggers inside your skin. For anyo