Glycine is the second most common amino acid in human proteins. A principal component of collagen production (it makes up one-third of collagen), glycine helps promote wound healing. It also supplies glucose for the body to use as energy, and plays vital roles in proper cell growth and function, as well as digestive health. Glycine helps break down ingested fats by regulating the secretion of bile acids from the gall bladder into the small intestine. Glycine acts as an inhibitory neurotransmitter that helps process motor and sensory information that permits movement, vision, and hearing.