What role does Selen play in blood sugar?

Selenium is an essential trace mineral that functions primarily through selenoproteins, which play roles in antioxidant defense and redox regulation. Some selenoproteins, such as glutathione peroxidases and selenoprotein P, are involved in insulin signaling and glucose metabolism. Epidemiological studies have shown both low and high selenium levels associated with impaired glucose tolerance and type 2 diabetes risk, suggesting a U-shaped relationship. However, randomized controlled trials have not consistently demonstrated that selenium supplementation improves blood sugar control; in some cases, supplementation in selenium-replete individuals may increase diabetes risk. Therefore, while selenium has a mechanistic link to blood sugar regulation, the evidence is mixed and not strong enough to recommend supplementation for glycemic control. Individual selenium status should be assessed before any intervention.