Vitamin B Complex factor. Panthenol is an active ingredient for sophisticated cosmetic skin care and hair care products. It improves the appearance of skin, hair and nails. D-Panthenol is the provitamin of D-Pantothenic acid (Vita min B5). D-Pantothenic acid plays a key role in the human intermediary metabolism. It is a part of the Coenzyme A. Deficiency of Vitamin B5 results in many dermatological disorder.