Glycine is an amino acid that plays an important role in many biochemical reactions in living cells. It is the simplest of all amino acids, with a single hydrogen atom as its side chain. Glycine is found in a wide range of proteins and enzymes, and is essential for the production of creatine, hemoglobin, and other neurotransmitters. It is also needed for the synthesis of hormones, enzymes, and DNA. Furthermore, it helps in the metabolism of glucose and fatty acids, and is essential for the development of strong bones and connective tissue. Glycine is used in the treatment of various medical conditions, such as muscle pain, ulcerative colitis, asthma, and kidney disease.