L-Lysine monohydrate is widely used in the food industry as a nutritional supplement to enhance the protein quality of various products, particularly in cereals and baked goods. It is also added to animal feed to promote growth and improve overall health in livestock. In the pharmaceutical sector, it is utilized in formulations to support immune function and aid in the recovery from illnesses, particularly herpes simplex virus infections. Additionally, it plays a role in cosmetic products, where it helps in skin repair and collagen synthesis, contributing to anti-aging and skin hydration benefits. Its application extends to sports nutrition, where it is included in supplements to support muscle recovery and protein synthesis.