Glycerin is a simple polyol compound. It is a colorless, odorless, non-toxic, and viscous liquid. As a humectant, glycerin works to moisturize the skin by drawing water from the air into the skin's outer layer. It also forms a protective layer that helps prevent moisture loss. Glycerin is a skin-replenishing and restoring ingredient. It is found naturally in the skin and helps to establish normal balance and hydration. Glycerin helps the skin maintain a healthy look and feel. Glycerin is a master at hydration and works best when combined with other replenishing and emollient ingredients.