Creatine is one of the most essential specialized nutritional supplements for athletes. It is one of the few supplements for athletes whose results are visible from the first workout. The results include: Rapid increase in strength Exercise endurance Muscle swelling Quick recovery Creatine is a safe and natural product that is synthesized from three amino acids: glycine, arginine, and methionine. It is recommended for strength and endurance athletes. Optimum Creatine is one of the purest forms of creatine monohydrate.