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.

L-Carnosine an organic compound composed of the amino acids histidine and beta- alanine. It's highly concentrated in important tissues like those of the brain, the heart, and the muscles.

Cell proliferation, nervous system functions and brain function all require adequate L-serine. It's considered non-essential only because a healthy body should be able to synthesize it; however, many people today find benefit in supplementation.

Swanson L-Tryptophan offers 500 mg of L-tryptophan per capsule to help support healthy serotonin levels and provide restful sleep.