To get bigger muscles, you need bigger muscle cells, and that means increasing muscle-cell "volume." That's why cell-volumizing supplements are so popular these days among bodybuilders.
Muscle-cell volume is naturally sustained by creatine, muscle glycogen and water. Studies tell us that by packing more water into muscles, test subjects have been able to gain several pounds of muscle water within days, which sound like only a short-term benefit since it's not muscle protein. But...