What is it
Panthenol is a provitamin derived from pantothenic acid (Vitamin B5) and alcohol. A provitamin is a substance that is converted into a vitamin (vitamin B5 in this case) inside a living cell.
What it does
Panthenol is a humectant: it draws water from the environment into skin, hair and nails, thus helping to keep them hydrated.
In addition, it can improve signs of aging, such as hyperpigmentation and redness
When used in hair care products, it can also reduce hair breakage.
Panthenol can cause contact dermatitis in some people.