L-Serine is an amino acid which supports neuron proliferation and health. It also supports the production of purines, pyrimdines, and important amino acids such as Tryptophan, L-Cystine, and Glycine. L-Serine also supports the proliferation and maintenance of new cells. While the body does produce some L-Serine, it does not do so in high enough quantities to meet all the body s demand for it so an external supply from diet or supplementation is recommended.