Glycerin is a clear and viscous liquid obtained by the hydrolysis of fats or oils (e.g. coconut, canola, tallow, or others), involving a continuous high-pressure steam process. The glycerin then is concentrated, refined, and purified.
Glycerin acts as a humectant to help maintain the integrity of soft-gelatin capsule shells. It also promotes the hydration of gum ghatti often used in supplement manufacturing.