We have used a very similar formula to IsoCream, replacing the xylitol with erythritol, keeping it all natural and great tasting! IsoShake is made with 100% NZ quality whey protein. Erythritol is also another low calorie, plant based sweetener. It’s natural, doesn’t cause side effects and tastes almost exactly like sugar without the calories. Basically, all the good stuff in regular sugar, with none of the bad stuff. With only 6% of the calories of sugar, it still has 70% of the sweetness. Sugar: 4 calories per gram. Erythritol: 0.24 calories per gram.