Evidence check: Selen in the context of Stress

Selenium is an essential trace element incorporated into selenoproteins (e.g., glutathione peroxidases) that combat oxidative stress and support thyroid function. Under stress, oxidative burden increases, and selenium might theoretically help. However, human evidence is moderate: some observational studies link low selenium to higher stress or anxiety, and supplementation may benefit those with deficiency, but effects are small and inconsistent. In well-nourished individuals, extra selenium shows no clear benefit. Toxicity risk exists at high intakes (>400 µg/day). Therefore, no general recommendation for selenium in stress; prioritize dietary sources (Brazil nuts, fish, eggs). Evidence: human-moderate.