Dosage Lookup

Selenium

2.9

Moderate

consensus

55-200mcg daily. The RDA is 55mcg, but functional medicine practitioners often recommend 100-200mcg for thyroid and immune support.

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

Andrew Huberman
Andrew Huberman
Recommends for Thyroid
Peter Attia
Peter Attia
No Direct Coverage
Rhonda Patrick
Rhonda Patrick
No Direct Coverage
Bryan Johnson
Bryan Johnson
No Direct Coverage
Mark Hyman
Mark Hyman
Strongly Recommends

What Each Expert Says

Andrew Huberman
Andrew Huberman
Recommends for Thyroid

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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More on Selenium

Consensus Score Which Form? When to Take Check Your Stack

Common Questions

How much Selenium should you take?

55-200mcg daily. The RDA is 55mcg, but functional medicine practitioners often recommend 100-200mcg for thyroid and immune support.

What form of Selenium is best?

Selenomethionine (organic, well-absorbed supplement form). Brazil nuts (1-3 per day provides ~68-274mcg). Fish, eggs, and organ meats as whole-food sources.

When should you take Selenium?

With food for better absorption. Can be taken with other thyroid-support nutrients (iodine, zinc, vitamin D).

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