L-Lysine HCl USP Granular K is the hydrochloride salt of the essential amino acid lysine, presented in granular form for enhanced stability and handling. It plays a key role in protein synthesis, calcium absorption, and collagen formation. As a USP grade ingredient, it is highly purified and suitable for use in pharmaceuticals, nutraceuticals, and fortified foods. It is widely applied in clinical nutrition, dietary supplements, and animal feed formulations.