Glycerin is commonly used a humectant that pulls water from the second layer of the skin and brings it to the top layer of the skin. It helps moisturize skin and is widely used in FDA-approved wound and burn treatments.
- Comedogenic rating of 0
- Defends against dryness
- Hydrates skin
- Moisturizing agent that pulls water into skin from deeper. It pulls the water from the deeper levels of skin and from the environment.
- According to a 2016 study, glycerin is “the most effective humectant.” I was compared to alpha hydroxy acids, such as lactic acid and glycolic acid, hyaluronic acid, propylene glycol and butylene glycol, sorbitol, and urea. 
- A recent study found a combination of glycerin, hyaluronic acid, and gotu kola (Centella asiatica extract) improves skin barrier function for up to 24 hours after application.