L-2-Amino-3-guanidinopropionic acid hydrochloride is a specialty chemical primarily used in biochemical research and pharmaceutical development. It serves as a precursor or intermediate in the synthesis of more complex organic compounds, particularly those with potential therapeutic applications. Due to its structural similarity to naturally occurring amino acids such as arginine and its role as a creatine analog, the compound is utilized in studies related to amino acid metabolism, protein synthesis, and energy metabolism, especially in muscle function, cardiac tissues, and metabolic disorders. It acts as an inhibitor of creatine kinase, aiding investigations into energy regulation, enzyme mechanisms, and biological processes. Additionally, it finds application in the development of peptide-based drugs, where it can be incorporated into peptide chains to modify their biological activity or stability. Its guanidinium group makes it useful in research involving enzyme inhibition and receptor binding studies, as it can interact with various biological targets.