While L-serine is classified as a non- essential amino acid, it is nonetheless important to a variety of structures and functions within your body. 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 from supplementation. High- purity, USP-grade AjiPure L-Serine is produced through a fermentation process by the amino experts at Japan's Ajinomoto, Amino Science LLC, the world leader in pharmaceutical-grade amino acids.