Nut & Seed · ingredient guide
Large tree nuts that are the single richest food source of selenium — so rich that just one or two a day can meet your needs.
Selenium supports normal thyroid function and antioxidant defenses, and Brazil nuts supply it in abundance — helpful for women mindful of thyroid health in midlife. The important caveat is that selenium has a tolerable upper limit (about 400 mcg/day for adults), and a single Brazil nut can contain 68–91 mcg, so a small handful can push you toward excess. Too much selenium over time causes selenosis (hair loss, brittle nails, GI upset). Keep to about 1–2 nuts a day; more is not better.
Food supports overall health — it doesn't treat or cure any condition. Talk to your clinician about symptoms, supplements, or a diagnosis.
About one or two. They're so concentrated in selenium that a few nuts can approach or exceed the safe upper limit of 400 mcg/day, and chronic excess causes selenosis.