Se-(Methyl)selenocysteine hydrochloride is widely used in research related to cancer prevention and treatment due to its potential chemopreventive properties. It is studied for its ability to induce apoptosis in cancer cells and inhibit tumor growth, making it a promising candidate in oncology studies. Additionally, it is utilized in nutritional research to explore the role of selenium compounds in human health, particularly in boosting antioxidant defenses and supporting immune function. Its applications also extend to the development of dietary supplements aimed at providing bioavailable selenium for maintaining overall health.