Selenium

Selenium (Se)

• Definition/Function: Trace element essential for the activity of antioxidant enzyme glutathione peroxidase and the conversion of T4 → T3 via iodothyronine deiodinase.

• Daily Requirement: ~55 µg/day (adult).

• Deficiency: Causes Keshan disease (cardiomyopathy) and muscle pain/weakness.

• Sources: Brazil nuts, seafood, meats, cereals.