We Are Largest Suppliers of D Panthenol. Panthenol is the alcohol analog of pantothenic acid vitamin B5, and is thus a provitamin of B5. In organisms it is quickly oxidized to pantothenate. Panthenol is a highly viscous transparent liquid at room temperature, but salts of pantothenic acid for example sodium pantothenate are powders typically white. It is soluble in water, Panthenol comes in two enantiomers, D and L. Only D-panthenol (dexpanthenol) is biologically active, however both forms have moisturizing properties. For cosmetic use, panthenol comes either in D form. D-panthenol use in cosmetics and pharmaceuticals companies..