Se-(Methyl)seleno-L-cysteine is primarily 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 compound in oncology. Additionally, it is explored for its antioxidant effects, which help in reducing oxidative stress and protecting cells from damage. This compound is also investigated in nutritional studies to understand its role as a dietary selenium source, which is essential for maintaining cellular functions and supporting the immune system. Its applications extend to the development of supplements aimed at improving overall health and preventing selenium deficiency-related disorders.