I've taken a supplement called creatine monohydrate. Dear Reader, Alice is glad that you asked because she has been flooded with similar questions.
Creatine is a substance manufactured in the human body by the liver and kidneys.
It is present in muscle, nerve, and sperm cells. In muscles, creatine is used to form phosphocreatine, which can be used to supply energy needed for muscle contractions. It has been suggested that by increasing creatine in the diet, one may increase the amount of phosphocreatine in the muscle, which would then provide a greater availability of high energy phosphate for energy production during muscle contraction. Over the past few years, studies have examined these questions, with differing results. One study by Greenhaff, et.