L-serine is a nonessential amino acid, it occurs naturally in an L-isomer form. L-serine is synthesized from glycine or theonine. It is involved in the biosynthesis of purines, pyrimidines, and other amino acids. L-serine plays a role in cell proliferation.

Serine is just one of tweny amino acids which form the building blocks of all the protein that make up the human body. Amino acids are also used in the formation of many enzymes needed for good health. Amino acids form living cells and the antibodies used by our immune systems, carry oxygen throughout the body and are involved in muscle activity. Since all the proteins crucial to our existence are composed of various combinations of amino acids, it is easy to understand their importance.

Serine's known benefits to proper human functioning are numerous. Serine is an integral component of particular phospholipids (fatty compounds) which are important constituents of cellular membranes. Serine also makes up brain proteins and nerve coverings. Serine aids in the production of immunoglobulins and antibodies. Serine, in turn, is needed to produce the amino acid, tryptophan, which is imperative to the construction of other important neurotransmitters. Tryptophan is a natural relaxant, relieves stress, anxiety and depression, and most critically is used in the making of serotonin. This chain of events in our metabolism displays that when we have reduced levels of serine not only do we lose the direct benefit of serine alone, but we will also miss out on the many benefits of tryptophan and serotonin.

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