Glycerin or Food Grade Glycerin is a clear liquid which is derived from animal products or plants. With syrup like consistency, it is odourless and has a slight sweet taste. The food and beverage industry uses glycerin as a preservative ingredient to help maintain moisture and avoid sugar crystallization. Besides smoothness, it also adds sweetness and texture to the edible products.
Source: https://www.bharatbook.com/pressrelease/food-grade-glycerin-market-a-popular-versatile-ingredient