L-Lysine dihydrochloride is widely used in the food and beverage industry as a nutritional supplement to fortify products, particularly in cereals, baked goods, and protein shakes. It serves as a critical source of the essential amino acid lysine, which supports protein synthesis and overall growth in humans and animals. In animal feed, it is added to enhance the nutritional value, promoting healthy development and improving feed efficiency, especially in poultry and swine. Additionally, it is utilized in pharmaceuticals to formulate dietary supplements that aid in treating lysine deficiencies and supporting immune function. Its role in skincare products includes promoting collagen production, which helps in maintaining skin elasticity and reducing signs of aging.