Panthenol is a provitamin and an alcohol derivative of pantothenic acid (vitamin B5). It benefits from being a humectant, emollient and moisturiser and has been a popular ingredient in both skin and hair products. Panthenol is said to able to strengthen, thicken and make the hair shiny. It has the ability to draw moisture into the hair from the surrounding environment. This extra moisture swells the hair shaft making it feel thicker and fuller. However, whether this effect is long lasting is questionable. There have been some debates as to whether panthenol has similar benefits to Vitamin B that is taken into the body internally. At present, there is limited evidence to suggest it has comparable effects.