Creatine is a natural substance that is synthesized in the body from three amino acids, L-Arginine, L-Glycine and L-Methionine. It's also found naturally in certain foods. EAS has a proprietary manufacturing process which eliminates unwanted by-products often found in lesser quality creatine. Inferior raw materials and manufacturing processes that are not continuously monitored or adapted to the product, result in impurities such as creatinine, dicyandiamide, dihydrotriazine and thiourea.