Ala-Lys hydrochloride is commonly used in the field of biochemistry and pharmaceutical research. It serves as a dipeptide model in studies investigating peptide structure, function, and interactions. This compound is often utilized in enzymatic assays to understand substrate specificity and enzyme kinetics, particularly for proteases and peptidases. Additionally, it is employed in the development of nutrient supplements and therapeutic peptides due to its role in protein synthesis and cellular repair. In cosmetic formulations, Ala-Lys hydrochloride is sometimes incorporated for its potential skin-conditioning properties, aiding in hydration and barrier function. Its applications also extend to the study of amino acid transport mechanisms and metabolic pathways in biological systems.