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The single densest dietary source of selenium — one nut usually covers 100–190% of the adult daily target.

1–2 nuts per day is the therapeutic dose. 3–4 daily as a habit crosses into selenosis territory.

Selenium switches on glutathione peroxidase and iodothyronine deiodinase — two enzymes your thyroid and antioxidant defences both run on.

Every Brazil nut is wild-harvested from the standing Amazon — the world's most economically valuable non-timber rainforest crop.