Creatine monohydrate is the most studied form of creatine. No other form of creatine has a through body of research demonstrating its positive effects for bodybuilders & athletes. Also, hundreds of studies conducted on thousands of research subjects using this form of creatine have demonstrated that it does not cause any negative side effects – no unwanted water retention, bloating, cramps, etc. Creatine monohydrate has however been proven in hundreds of studies to increase muscle size & strength & to improve performance during repeated bouts of high-intensity exercise.