What role does Selen play in stress?

Selenium is an essential trace mineral that functions as a cofactor for selenoproteins such as glutathione peroxidases (GPx) and thioredoxin reductases, which protect cells from oxidative damage. Oxidative stress is a key component of the physiological response to psychological or physical stress. Adequate selenium status supports antioxidant capacity and may help modulate stress-induced inflammation. However, direct evidence that selenium supplementation reduces perceived stress or improves stress resilience in humans is limited and inconsistent. Most data come from observational studies or mechanistic models; randomized controlled trials show mixed results, often in populations with low baseline selenium. Importantly, excess selenium is toxic (selenosis), and routine supplementation is not recommended without confirmed deficiency. Genetic variants in selenoprotein genes (e.g., GPX1, SEPP1) have small effects and are not actionable without biomarker testing. In summary, selenium plays a supportive role in managing oxidative stress, but the evidence for a direct stress-reducing effect is weak and primarily mechanistic.