McCall McPhersonFounder, Modern Thyroid Clinic.

Two Brazil nuts a day for selenium? #selenium #brazilnuts #brazilnutsbenefits #thyroid

26 Jun 2026 · 1 min

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McCall McPherson says two Brazil nuts a day won't reliably lower Hashimoto's antibodies because selenium content varies wildly. She recommends a standardized supplement instead for 90 days, measured against antibody levels at the start and end, since supplements are cheaper and more predictable than nuts.

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2 Brazil nuts a day for selenium for your thyroid actually isn't the best strategy. Does it hurt? No, of course not, right? But if you're really trying to be diligent, if you're really trying to, let's say, collect data on your Hashimoto's antibodies, because selenium has been shown to reduce Hashimoto's antibodies literally in 3 months, you want to isolate variables. You want to be consistent. You want predictability and control. So in my opinion, the best way to do that is to take a selenium-based supplement for 90 days, measure your antibodies day zero, measure them day 90, and see how they've changed. The amount of selenium in Brazil nuts can vary. There's too much variance to collect real data and truly see if it's able to make an impact. Of course you can add them in, et cetera, no problem, but let's not solely rely on that. Also, eating 2 Brazil nuts a day is probably honestly more expensive than taking the supplement. The supplement's cheap, Predictable, controllable. You guys know I'm all about predictability and control with thyroid, so that's my advice.