Dosage Lookup
Selenium
2.9
Moderate
consensus
Based on expert consensus data from publicly available videos, not medical advice. Always consult your healthcare provider before starting, stopping, or changing any supplement.
Consensus Protocol
Dosage
- 55-200mcg daily
- The RDA is 55mcg, but functional medicine practitioners often recommend 100-200mcg for thyroid and immune support
Form
- Selenomethionine (organic, well-absorbed supplement form)
- Brazil nuts (1-3 per day provides ~68-274mcg)
- Fish, eggs, and organ meats as whole-food sources
Timing
- With food for better absorption
- Can be taken with other thyroid-support nutrients (iodine, zinc, vitamin D)
Notes
- Selenium has a narrow therapeutic window — the tolerable upper limit is 400mcg/day
- Chronic excess can cause selenosis (hair loss, GI distress, nail brittleness, garlic breath)
- Brazil nut selenium content varies significantly by origin — South American nuts are typically highest
- If supplementing, do not stack with high-selenium foods without calculating total intake
Expert Positions
What Each Expert Says
Huberman discusses selenium across 3 videos, primarily in the context of thyroid hormone production and metabolic health. He emphasizes that selenium, alongside iodine and L-tyrosine, is crucial for healthy thyroid hormone production (T3 and T4). He notes that many individuals may not get enough selenium from their diet and recommends Brazil nuts as a practical food source. In his fat loss video, he lists proper iodine/selenium intake among his foundational health protocols for metabolic function.
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