L-Serine is a non-essential amino acid that plays a crucial role in the synthesis of other amino acids, including glycine and cysteine. It is involved in the synthesis of phospholipids, which are important components of cell membranes. Serine serves as a precursor for neurotransmitters and is important for brain function and cognitive health. It also plays a role in the synthesis of purines and pyrimidines, which are building blocks of DNA and RNA.