Used in biochemical research to study the role of selenium in biological systems, particularly in the synthesis of selenoproteins, which are crucial for antioxidant defense and thyroid hormone metabolism. It serves as a precursor for selenocysteine, an essential amino acid incorporated into proteins. Applied in nutritional studies to explore selenium supplementation and its impact on health, including immune function and oxidative stress reduction. Also utilized in the development of selenium-enriched products to address dietary deficiencies. Its role in cancer research is significant, as selenium compounds are investigated for their potential chemopreventive properties.