Is Selen useful for stress?

The provided context does not contain direct evidence regarding selenium's usefulness for stress. Selenium is an essential trace mineral with antioxidant properties and a role in thyroid function, which could theoretically influence stress responses. However, the context only discusses stress in relation to cortisol, diet, and sleep, without mentioning selenium. Therefore, the evidence for selenium supplementation specifically for stress is unclear. A balanced diet typically provides sufficient selenium; excessive intake can be toxic. No clinical recommendations can be derived from the given information.