L-Lysine HCl is widely used in the food and beverage industry as a nutritional supplement to fortify products, particularly in cereals, baked goods, and protein shakes, to enhance their amino acid content. It is essential for human health, as it supports protein synthesis, immune function, and calcium absorption, making it a key ingredient in dietary supplements and health products.

In animal feed, it is added to improve the growth and development of livestock by ensuring they receive adequate lysine, which is often limited in plant-based feeds. This helps optimize feed efficiency and promotes healthier, faster-growing animals.

In the pharmaceutical industry, it is utilized in formulations to treat and prevent lysine deficiency, herpes simplex virus infections, and to support recovery after surgery or injury. Its role in collagen production also makes it valuable in skincare products aimed at improving skin elasticity and repair.

Additionally, it is used in cell culture media as a nutrient source for the growth of microorganisms and mammalian cells in biotechnological research and production processes.