Glycine is a nonessential amino acid. This means that glycine can be synthesized in the human body, as sources for that are the amino acids serine and threonine.
Glycine is present in both animal and plant sources. Because its main concentrations are in the soft tissues, animal sources are far richer in concentration.
The richest source of glycine is the gelatin protein and all sources of gelatin - cartilage, skin, and other soft tissues. The main biological role of glycine is for the formation of proteins.
It is a key product for the synthesis of collagen and it interacts with hydroxyproline. Glycine is involved in the construction of some acids like nucleic acid, bile, and creatine phosphate.
The more important role of glycine is for the central nervous system. It functions as an inhibiting neurotransmitter mainly in the spinal cord, retina and brain cells.
As a neurotransmitter glycine interacts with taurine and GABA.
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