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Selenium

A trace mineral the thyroid needs to activate its hormones and protect itself. Some studies show it lowers thyroid antibodies in Hashimoto's.

Supplements can interact with medications and aren't right for everyone, especially during pregnancy or breastfeeding, or with a chronic condition. Ask your provider before you start.

Studied for

  • Thyroid support
  • Hashimoto's (thyroid antibodies)
  • Mild thyroid eye disease (with your eye doctor)

Found naturally in

  • Brazil nuts
  • Seafood
  • Eggs
  • Poultry
What variations of selenium exist?Our top pick, what to skip, and how to read the label

Label red flags

  • More than 200 mcg per serving
  • Selenium stacked across a multi, thyroid formula, and Brazil nuts

Check with a provider

  • Signs of too much: garlic-smelling breath, metallic taste, brittle hair or nails
  • Long-term high doses have been linked to a higher risk of type 2 diabetes

Related conditions

Hashimoto's thyroiditisGraves' disease

Supplements that contain it

3 products in Dr. Lesher's dispensary list selenium on the label.

Check with your provider before taking any of these, especially if you're pregnant or take medications.

Parts of the body it affects

Explore what each area does and the conditions that can affect it.

Illustration of the thyroid gland in the front of the neck

Thyroid

This butterfly-shaped gland in your neck sets the pace of your metabolism. Autoimmune disease is the most common cause of thyroid problems.

Illustrations: Servier Medical Art, CC BY 4.0

Dr. Lesher, ND

Ready to find the root cause?

Dr. Lesher is a Naturopathic Doctor who focuses on autoimmune and chronic conditions in women. Since 2020, she's helped hundreds of patients stop managing symptoms and start healing.

Book a consult now