Alcohol form of the B vitamin pantothenic acid. Panthenol is used in skincare products as a humectant because of its ability to attract and hold moisture. Sometimes called pro-vitamin B5, panthenol mixes readily with many different types of ingredients, making it a versatile ingredient to be used in formulas because it improves skin’s barrier function and maintains the proliferation of fibroblasts, the cells that create collagen. 
- Camargo F, Gaspar L, Campos P. Skin moisturizing effects of panthenol-based formulations. J Cosmet Sci. 2011;62(4):361-70.