Nutrition and Supplements Amino acids Swanson AjiPure Glycine 500 mg 60 Capsules 65 gr Glycine is the simplest amino acid and is found in the protein of all life forms. In nutrition, glycine is used as a component for parenteral and enteral nutrition. Glycine is of major importance in the synthesis of proteins, peptides, purines, nucleic acids and other amino acids. Glycine is also a neurotransmitter in the central nervous system. It is believed that glycine may be a novel antioxidant.