Can Selen help with Schlaf?

Whether selenium can help with sleep is not scientifically clear-cut. Selenium is an essential trace mineral that, as part of selenoproteins, plays a key role in antioxidant defense and thyroid metabolism. Thyroid hormones, in turn, influence circadian rhythms and sleep regulation. Some observational studies suggest a link between low selenium levels and poorer sleep quality, but randomized controlled trials demonstrating a causal benefit of selenium supplementation are lacking. Moreover, the evidence is mixed: some studies show no significant improvement. Importantly, supplementing selenium without a confirmed deficiency can be risky, as high doses are toxic (selenosis). For sleep issues, the primary focus should be on sleep hygiene, stress management, and medical evaluation if needed. A selenium test (e.g., via MyBody-X) can identify a deficiency, but taking selenium generically 'for better sleep' is not evidence-based. The evidence is moderate, with clear limitations.