Glycerine, a sugar alcohol, is an ingredient in Glucerna Shakes and Snack Shakes. Glycerine is a low-glycemic carbohydrate that functions as a sweetener. Like maltitol, glycerine is classified as a sugar alcohol. However, unlike maltitol, which is only partially metabolized and provides 2 calories per gram, glycerine is completely metabolized like a carbohydrate and provides 4 calories per gram. This difference in metabolism is key to removing the risk for GI side effects.
Glycerine is declared as GRAS (Generally Recognized As Safe) by the FDA and has an upper threshold of 125 grams per day. Glycerine also may be referred to as glycerol; they are the same substance. Glycerine is listed with the ingredients on Glucerna products. There are 3.8 grams of glycerine in Glucerna Shakes and 3.0 grams in Glucerna Snack Shakes. This included in the total carbohydrate grams claimed on the product label.