Creatine monohydrate is a well-researched dietary supplement that increases the energy available to muscle cells, enhancing performance in short-duration, high-intensity exercises by improving muscle strength, size, and power. It is the most studied form of creatine and works by helping the body produce adenosine triphosphate (ATP), the primary energy source for muscle contraction. While generally considered safe for short-term use, potential adverse effects can include transient water retention, and long-term safety data is lacking.