Take creatine supplements to build mass more quickly. Creatine is a substance that is found naturally in the body and is a safe supplement to take as long as you follow the directions on the label and research possible side effects (see resource below.) Creatine will make you stronger not because of added muscle, but because it fuels your muscles. The increase of size gained from creatine is a result of extra water retention. Creatine will make you look bigger and allow you to work out harder, so make sure to drink plenty of water while taking creatine.