Glycerin
Glycerol has long been a key ingredient in topical dermatological preparations. It plays an important role in promoting skin hydration and enhancing cutaneous elasticity. Known for its moisturizing properties, glycerol is often used to support the skin's barrier function, helping to maintain its protective qualities. It contributes to keeping the skin's surface smooth and resilient, aiding in the defense against environmental irritants. Additionally, glycerol is recognized for helping to maintain the skin’s moisture balance, especially under conditions that might otherwise lead to dryness.
Source(s):
https://pubmed.ncbi.nlm.nih.gov/18510666/