L-Glycine is an amino acid essential for many different muscle, cognitive and metabolic functions. It helps break down and transport nutrients like glycogen and fat to be used by cells for energy, and in the process, it supports strong, digestive and nervous systems. In the human body, glycine is found in high concentrations in the skin, connective tissues of the joints and muscle tissue. One of the key amino acids used to form collagen and gelatin, glycine can be found in bone broth and other protein sources. In fact, glycine is part of what gives “superfood” bone broth its amazing healing ability.