Glycine is the simplest amino acid, consisting of a single hydrogen atom as its side chain. It serves as a fundamental building block in protein synthesis, particularly in collagen formation, and functions as an inhibitory neurotransmitter in the central nervous system. In food applications, glycine acts as a flavor enhancer, sweetener, and nutritional supplement, commonly found in meat, fish, and dairy products. It exists predominantly as a zwitterion at physiological pH, exhibits high water solubility, and decomposes at its melting point of approximately 233°C. Glycine is naturally occurring, non-toxic, and recognized for its role in metabolic processes including the synthesis of purines, creatine, and glutathione.