(R)-2-Amino-3-mercapto-2-methylpropanoic acid is primarily used in the synthesis of pharmaceuticals, particularly in the development of drugs targeting cardiovascular diseases. Its unique structure allows it to act as a precursor for compounds that inhibit angiotensin-converting enzyme (ACE), which is crucial in managing hypertension. Additionally, it is employed in the production of chelating agents that bind to heavy metals, making it valuable in detoxification therapies. Its application extends to biochemical research, where it serves as a building block for peptides and proteins, aiding in the study of enzyme mechanisms and protein folding.