DL-Arginine is widely used in pharmaceutical and biotechnology applications, particularly in the formulation of parenteral nutrition solutions. It serves as a source of nitrogen and supports the synthesis of proteins and nitric oxide in the body. In clinical settings, it aids in the treatment of urea cycle disorders by promoting ammonia detoxification through the formation of urea. It is also employed in cell culture media to support the growth of mammalian cells, especially in recombinant protein production and vaccine development. Due to its role in stimulating insulin and growth hormone release, DL-Arginine is included in some diagnostic tests and performance supplements. In research, it is used to study amino acid metabolism and transport mechanisms. Additionally, it finds use in cosmetic formulations for its skin-conditioning properties and potential to enhance wound healing.