Panthenol is primarily a conditioning agent for hair and skin that is a vitamin B5 derivative. According to EWG's Skin Deep Cosmetics Database, it is a substance that comes from plant or animal sources but can also be made synthetically.
In addition to Panthenol’s uses in skin and hair care, it is also used in the food industry as an additive, notes EWG. There are no toxic concerns with this substance.
According to Curly Nikki Life & Hair Therapy, Panthenol helps to smooth the hair with no waxy buildup and promotes shine. The ingredient has also been lauded for increasing hair growth. In skin care, Panthenol increases skin hydration, improves skin elasticity and promotes cell regeneration.