Supplements Strong evidence

Selenium

A trace mineral with a narrow useful range.

Selenium is in glutathione enzymes and thyroid conversion. Brazil nuts can overshoot a day’s need in one snack. A 50–100 mcg capsule is enough if your soil and diet are low — not 400 mcg “for immunity.”

How to use

50–100 mcg with food. Skip it if you already eat Brazil nuts often.

Details

Ingredients
Selenomethionine
Benefits
Antioxidant enzymes, Thyroid cofactor
Dosage
50–100 mcg
When to take
Morning, With food
Side effects
Hair/nail changes and garlic breath at high chronic doses.
Scientific evidence
Status matters; extra selenium in replete people has not delivered the cancer-prevention headlines of the 2000s.
Form
Capsule
Third-party tested
Yes

Editorial rating ★ 4.0

Small dose, real mineral. Toxicity is the amateur error.

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