Creatine is a natural substance that is naturally produced in the body. It can additionally be obtained by eating meat or through creatine supplement. Creatine is heavily researched with successful results and perfectly safe.
It helps provide energy to our muscles for explosive work. When our body uses ATP (cellular energy), it becomes ADP. Creatine donates one of its phosphate groups to ADP and reforms ATP. That reformed ATP once again provides our muscles with energy that we use when we exercise.
Also creatine draws water into our muscle cells. Hydrated muscle cells increase muscle protein synthesis for muscle growth.