How does Mass Gainer work? Is it good for you? What protein shake do I need to take? These questions come up quite often. Mass Gainer Protein Shake is a blend of high protein and carbohydrate content. Proteins provide the amino acids necessary to build muscles, and carbohydrates increase calories which provide the body with the necessary energy. People with a fast metabolism usually suffer from a caloric deficiency, hence their problems with gaining weight. If this person adds exercises in the gym, they will have to compensate for the lost energy with additional calories from mass gainers. In this category you will also find carbohydrate-only products that are ideal for consumption during exercise. Carbohydrates replenish lost glycogen quickly and nicely stimulate highly anabolic insulin. Mass gainer is important to protect your body from significant weight loss and help to put on a few pounds.