Well, it sure is better to increase your mass, but definitely not only the muscle mass. Among the ingredients I have seen suicralose, which is basically sugar - only idiots will add to a protein product raw sugar! When taking protein, the point is to get as much protein as possible with the least amount of carbs. With the modern foods you get plenty of carbs, and it is really hard to control the amount of protein. Therefore, better choose something made only with whey isolate, such as the Isolation. There are no artificial sweetners, nor additives (let alone sugar), and it tastes pretty damn good. All in all, it is my favorite product because it is so clean in terms of nutrients, and gives me everything I need.