Creatine monohydrate is a natural compound found in the human body and is obtained in the diet primarily from meat and fish. Creatine is a popular supplement among active people because of its ability to serve as an energy reserve, especially during intense physical exertion.
During short, intense periods of activity, the body breaks down adenosine triphosphate (ATP) into adenosine diphosphate (ADP) and phosphate for energy. Creatine helps the body convert ADP to ATP, providing higher amounts of ATP for energy, which can increase endurance and strength in the short term. Creatine can also be stored for later use by cells, creating the "energy reservoir" that active individuals desire.