N-Me-Val-OH.HCl is the hydrochloride salt of N-methyl-L-valine, an N-methylated amino acid derivative used as a building block in peptide synthesis. It facilitates the incorporation of N-methylvaline residues into peptides, which can improve peptide stability, bioavailability, and resistance to proteolysis. This compound is especially useful in solid-phase peptide synthesis (SPPS) for constructing complex peptide sequences in pharmaceutical development. The salt form enhances solubility in polar solvents and stability during handling and reactions. It is also applied in biochemical research to investigate the effects of N-methylation on protein structure, folding, and function.