Selenium (Brazil Nuts) Bertholletia excelsa

What is Selenium (Brazil Nuts)?

Selenium (Brazil Nuts) (Bertholletia excelsa) is a botanical traditionally used for essential trace mineral for thyroid enzyme function. It is associated with 🩻 thyroid support health.

What it's being explored for today

Selenium is required for deiodinase enzymes that convert T4 to active T3. Selenium deficiency impairs thyroid function even with adequate iodine. Also studied for reducing thyroid antibodies in Hashimoto's

How to use Selenium (Brazil Nuts)

Eat 1–3 Brazil nuts daily (each contains ~70–90 mcg selenium; RDA is 55 mcg). This is one of the simplest and most effective thyroid supports. As supplement: 100–200 mcg selenomethionine daily — do NOT exceed 400 mcg/day.

Safety & precautions

⚠ Selenium is toxic in excess — do NOT take more than 400 mcg/day total from all sources. Symptoms of excess: garlic breath, hair loss, brittle nails, fatigue. 1–3 Brazil nuts daily is sufficient for most people. If supplementing, have selenium levels checked periodically.

How Selenium (Brazil Nuts) fits the Plateau-proof Diet

The Plateau-proof Diet treats botanicals as accelerators, not replacements. The 15-day CP/FP rotation does the heavy lifting on metabolic adaptation; botanicals like Selenium (Brazil Nuts) complement that by supporting your 🩻 thyroid support systems while you do the work.

Inside Adipofyte, your AI coach Maya tracks how each botanical you log affects your check-ins, weight trend, and energy — so over time you learn what actually moves the needle for your body.

Frequently asked questions about Selenium (Brazil Nuts)

Other botanicals for 🩻 thyroid support health