I've been taking "Strength and Muscle Men's Formula," a creatine product invented by Beachbody.com, and I realize it's causing my muscles to cramp sometimes. After reading about the side effects of creatine, I'd like to stay away from it, but I need a substitute. What product would you recommend, guys? I want something that's harmless and that will make me strong and big. Please advise. thank you very much.