What it is
Panthenol is the alcohol analog of pantothenic acid (vitamin B5) and is therefore a provitamin of B5; once absorbed through skin it is converted into pantothenic acid, a building block of coenzyme A. At room temperature it is a viscous, odorless, slightly bitter liquid. In topical formulas it works as a humectant that helps skin attract and hold water while supporting the skin barrier, and it is valued for a soothing, skin-conditioning effect. Both the biologically active D-form and racemic D/L mixtures are used cosmetically.
Safety & warnings
Panthenol is generally well tolerated on skin and is commonly chosen for sensitive-skin and post-irritation formulas. Rare cases of skin irritation and contact allergy have been reported in the medical literature, so individuals with known sensitivities should patch test, but reactions are uncommon relative to how widely it is used.
Origin & sourcing
Panthenol is produced synthetically for cosmetic and pharmaceutical use. The biologically active D-form (dexpanthenol) is the version the body converts to pantothenic acid, while a racemic mixture of the D and L enantiomers is also used because both offer moisturizing benefit. It is supplied as a viscous, water-soluble liquid that blends easily into water-based formulas.
History
Panthenol is the provitamin of pantothenic acid, the B-vitamin whose name reflects its widespread occurrence in living tissue. It has a long-standing role in pharmaceutical and cosmetic products, where it is used as a moisturizer and to help with wound healing, and it converts to pantothenic acid for use in coenzyme A synthesis once absorbed.
Questions everyone asks
Is panthenol the same as vitamin B5?
It is the provitamin form. Panthenol is the alcohol analog of pantothenic acid (vitamin B5) and converts to pantothenic acid once absorbed into the skin.
What does panthenol do in a sunscreen?
It acts mainly as a humectant and soothing, skin-conditioning agent, helping skin hold water and supporting the barrier alongside the UV filters.
Is panthenol good for sensitive skin?
It is generally well tolerated and is often included in formulas aimed at sensitive or easily irritated skin, though rare allergy reports exist, so patch testing is sensible.