Ingredient guide
Selenium is an essential trace mineral central to thyroid hormones and antioxidant enzymes. It has a narrow safe range. Too little and too much both cause problems, and the upper limit is only 400 mcg per day.
Moderate evidenceSelenium is an essential trace mineral. Your body needs only micrograms of it, but those micrograms are vital. Selenium is built into special proteins called selenoproteins, which run some of your most important antioxidant and thyroid reactions. Brazil nuts are by far the richest food source, followed by seafood, meat, and grains.
Selenium has two headline jobs. First, it is part of enzymes that neutralise reactive molecules, helping protect cells from oxidative stress. Second, it helps convert thyroid hormone into its active form, which is why the thyroid holds more selenium per gram than any other organ.
The clearest benefit is correcting a shortfall. In regions where soil selenium is low, deficiency is real and supplementing helps. In thyroid health, several trials show that selenium can lower thyroid antibody levels in people with autoimmune thyroid conditions, though whether that changes how people feel is less certain.
The crucial point with selenium is the narrow window. Unlike most minerals, the dose that helps and the dose that harms are not far apart. Routine high-dose selenium in people who are already replete brings no clear benefit and raises the risk of toxicity. We grade the evidence as moderate, with a strong deficiency and thyroid story and a firm ceiling.
Most people in selenium-rich regions get enough from food, and a couple of Brazil nuts a day can be plenty on its own. If you supplement, mind your total across multivitamins, single products, and nuts, and stay under 400 mcg per day. Your healthcare provider can confirm whether you need extra before you start.
The adult recommended intake is about 55 mcg per day, and a few Brazil nuts can cover it. The tolerable upper limit is 400 mcg per day from all sources. The safe range is narrow, so more is not better. Ask your healthcare provider before taking high-dose selenium, especially with other mineral products.
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Selenium supports normal thyroid hormone production, and some trials show it lowers thyroid antibodies in autoimmune thyroid conditions. Discuss it with your doctor first.
Very good, and potent. A couple of Brazil nuts can supply your daily need, so eating many alongside a supplement can push you toward excess.
A garlic-like breath odour, brittle nails, hair loss, and stomach upset can signal excess. The safe range is narrow, so stay under the upper limit.