Creatine supplementation has been popular for over two decades for its ability to help athletes and muscle builders get bigger and stronger. It has been the subject of thousands of research studies to determine its efficacy and safety, and so far, it’s been used successfully and safely by millions...

Since creatine’s introduction into the general public’s awareness two decades ago, stories have occasionally surfaced about adverse side effects: cramping, kidney damage, diarrhea. Are these stories based on scientific evidence, or are they the athletic equivalent of urban myths? When...