Glycerine and diet

What are the effects of Glycerine on low-carb/ketogenic diets? All these protein bars are pretty low carb (and some new MRPs have 'em too), but they have a lot of glycerine. Will they knock you out of ketosis and are they suitable if you are trying to control carb intake - thanks

Glycerol is useful on a ketogenic diet as an alternate energy substrate. Triglycerides are broken down into three fatty acid chains and a glycerol molecule. Glycerol can then be used by the body to produce pyruvate and then glucose. There is a problem though. Glycerol has 4 calories per gram and can offset the metabolic shift into ketosis if too much is consumed. It is a great supplement to kill the low glucose zombie-like state when first getting into ketosis.