Is Selen useful for Müdigkeit?

Selenium is an essential trace element important for thyroid function and immune health. Deficiency can contribute to fatigue, but in well-nourished individuals, extra selenium does not reliably reduce tiredness. Evidence is based on observational and mechanistic studies; RCTs show no clear benefit for fatigue in non-deficient populations. Caution: selenium is toxic at high doses (selenosis). A blood test (e.g., MyBody-X) can assess status before supplementation.