Creatine is a naturally occurring compound that plays a crucial role in the production of energy during rigorous exercise and metabolic stress. One of the primary functions of creatine is to help regenerate adenosine triphosphate (ATP), the body's main energy source. During periods of intense physical exertion, such as weightlifting or sprinting, ATP levels can diminish rapidly. Low ATP levels can lead to muscle fatigue and energy exhaustion. Creatine helps to support optimal ATP levels during times of increased energy demand.