Dietary Supplement. The Revolutionary Science of Muscle Mass & Strength* Pharmaceutical Grade. 100% pure creatine monohydrate. Boosts muscle strength gains*. Accelerates power & recovery from exercise*. Met-Rx® Creatine Powder. Creatine is an excellent supplemental choice for athletes and active adults. Creatine is a key player in energy transfer within muscles.*. Creatine enhances the ability to produce higher muscular force,.