Creatine does not build muscle, but it certainly does more than just cause water retention. The only things that will build muscle are proper training, recovery, and diet- that new muscle needs food to grow. As for creatine, the quick and dirty is that it recycles ATP, which allows for more energy. Personally I would recommend it if, 1) you are over 18 (there are at least a few studies showing the harsh effects of creatine on underdeveloped kidneys), 2) your training and diet are spot on perfect, and 3) you have double checked #2. -EK