Optimum Nutrition Creatine Unflavoured 2500mg (200caps). Creatine Capsules. Creatine is a naturally-occurring compound found in the brain and muscle, which plays an important role in the short-term energy system. While we make creatine in the body and also consume through meat and fish, additional intake is required to saturate the creatine stores in the body.. Food Supplement, capsule with creatine. Food supplements are not to be used as a substitute for a varied diet. Do not exceed the recommended daily dose. Keep out of reach of children.