So, what does creatine do, and why do people need it? Creatine, specifically in the form known as phosphocreatine (PCr), plays a crucial role in providing the energy our muscles need during intense exercise. When we work out, our bodies use up a substance called ATP, which is like fuel for our muscles. Phosphocreatine helps to quickly restore ATP levels, ensuring that our muscles have the energy they need to continue performing well during and after physical activity.1 | 
