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Selenium
Primary Use / Function: Antioxidant support, thyroid function, immune system health, and fertility (especially male)
Daily Dose Range: 55–200 mcg (upper limit: 400 mcg/day)
Frequency: Once daily
With Food? Yes
Enhancing Combinations：Vitamin E (synergistic antioxidant effect)
Iodine (for optimal thyroid hormone metabolism)
Gender Specific：No
Contraindications / Cautions: High doses can cause selenium toxicity (symptoms: hair/nail loss, garlic breath, irritability)
Use caution with long-term high-dose use
Notes: Commonly used in thyroid formulas
Found naturally in Brazil nuts, though levels vary
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