Selenium
A trace mineral that's a secret powerhouse for your thyroid and immune system — and it's one where a tiny amount does huge work, so you don't need much.
Benefits
- +Essential for thyroid hormone production and function
- +Powerful antioxidant (selenoproteins protect cells)
- +Supports immune system and may help fight infections
- +May reduce risk of certain cancers (especially prostate)
- +Supports healthy fertility in men
- +Important for healthy hair and nails
Dosage & Cost
The RDA is 55 mcg, but 100–200 mcg is a common supplemental dose. The upper tolerable limit is 400 mcg — stay well below that. Selenomethionine is a well-absorbed organic form. A single Brazil nut gives you a full day's dose naturally.
Side Effects
- !Selenium toxicity (selenosis) at high doses: hair loss, nail brittleness, GI issues
- !Garlic-like breath odor
- !Nausea and stomach upset
- !Toxicity threshold is relatively close to the beneficial dose — don't overdo it
Food Sources
- • Brazil nuts (1–2 nuts = full daily dose)
- • Seafood (tuna, salmon, shrimp)
- • Eggs
- • Beef and pork
- • Chicken and turkey
- • Mushrooms
References & Links
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This page is for informational purposes only. The information here has not been evaluated by the Food and Drug Administration (FDA). No supplement discussed on this page is intended to diagnose, treat, cure, or prevent any disease. Please consult your doctor or a qualified healthcare professional before taking any dietary supplement.