— § 01
What panthenol actually is.
Panthenol is the alcohol pro-form of pantothenic acid (vitamin B5). On contact with skin tissue it is enzymatically converted to pantothenic acid, which is a cofactor in coenzyme A synthesis — a central node in fatty-acid metabolism, ceramide assembly, and inflammatory signalling. The cosmetic effect is dual: humectant on the surface, metabolic support inside the keratinocyte.