L-Serine is widely used in the pharmaceutical industry as a key ingredient in parenteral nutrition solutions, especially for patients who cannot obtain sufficient nutrients through oral intake. It supports protein synthesis and is vital for proper metabolic function. In cell culture and biotechnology, L-Serine is added to growth media to support the proliferation of mammalian cells, including those used in the production of monoclonal antibodies and vaccines. It serves as a building block for proteins and helps maintain cellular redox balance by contributing to glutathione synthesis. The cosmetic industry utilizes L-Serine for its moisturizing properties. It is found in skincare products due to its ability to enhance skin hydration and support the skin barrier, often as part of natural moisturizing factors (NMFs). L-Serine also shows potential in neurological research. Studies suggest that supplementation may help in certain genetic disorders affecting the central nervous system, such as serine deficiency disorders, where it can help improve developmental and neurological symptoms when administered early.