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BRAND NEW FORMULA! L-Serine is an amino acid that fulfillls multiple functions in the body: it helps the central nervous system, immune system, and muscular system function normally, and is converted into D-serine to activate specific receptors in the brain. L-serine is also a precursor of other amino acids used by the body. Recent research suggests that supplementing with L-Serine is an effective way of helping to preserve and restore memory.