ANS Performance Creatine Monohydrate - Creatine is a natural substance that turns into creatine phosphate in the body. Creatine phosphate helps make a substance called adenosine triphosphate (ATP). ATP provides the energy for muscle contractions. Creatine increases lean muscle mass when used in conjunction with a resistance training regimen. Improves performance in repetitive bouts of brief, highly-intense physical activity by increasing intramuscular energy levels.