Sodium selenite is widely utilized in research focused on:

• Nutritional Supplements: It serves as a source of selenium, an essential trace element that supports immune function and antioxidant activity. This makes it valuable in dietary supplements aimed at improving overall health.
• Pharmaceuticals: Sodium selenite is used in the development of certain medications, particularly those targeting cancer. Its ability to induce apoptosis in cancer cells is being explored in various therapeutic strategies.
• Analytical Chemistry: In laboratories, it is employed as a reagent for the determination of selenium levels in environmental samples, ensuring compliance with safety regulations and environmental standards.
• Agriculture: It is applied in agriculture as a micronutrient to enhance soil quality and crop yield, particularly in selenium-deficient areas, thus improving food security.
• Biotechnology: Sodium selenite is utilized in cell culture media to promote the growth of specific cell lines, aiding in research and development in the fields of genetics and molecular biology.