What should I know about selen wirkung dosierung und die besten quellen?

Selenium is an essential trace mineral critical for antioxidant defense (glutathione peroxidases), thyroid hormone metabolism, and immune function. The recommended dietary allowance for adults is about 55 µg/day, with a tolerable upper intake level of 400 µg/day. Excessive intake can cause selenosis, characterized by garlic breath, hair loss, and neurological symptoms. Best dietary sources include Brazil nuts (1–2 nuts meet daily needs), tuna, sardines, beef liver, eggs, and whole grains. Selenium content in plant foods varies by soil. MyBody-X DNA tests may analyze variants in selenoprotein genes (e.g., SEPP1, GPX1), but the impact on individual requirements is small and not clinically robust. Evidence is mixed: human studies support selenium's role, but nutrigenetic guidance remains weak. Do not rely solely on DNA results; prioritize a balanced diet and consult a healthcare provider before taking high-dose supplements.