Overview
Antioxidant trace element for thyroid.
- Whole foods (leafy greens, legumes, nuts, seeds, seafood, animal proteins)
- Fortified foods such as cereals, breads, plant milks, and table salt
- Mineral supplements as chelates, citrates, glycinates, or inorganic salts
- Chelated form (glycinate, bisglycinate, citrate, malate)
- Inorganic salt (oxide, sulfate, chloride)
- Liquid ionic solution
- Topical or transdermal preparation
Mechanism of action
Cofactor for glutathione peroxidase and deiodinases.
- · Cofactor for glutathione peroxidase
- · deiodinases
Effects on the body
Organ system effects
Selenium (Selenomethionine) modulates innate and adaptive immune responses, including cytokine signaling and barrier function.
Selenium (Selenomethionine) acts on hallmarks of aging including oxidative stress, mitochondrial dysfunction, and senescence signaling.
Evidence-based benefits
Reduces thyroid antibodies
Moderate evidencePotential side effects
- · Selenosis at high doses
Drug interactions
Safety & non-supplemental interactions
Educational summary — always confirm with your clinician or pharmacist before starting, stopping, or combining with prescription therapy.
- ·Autoimmune disease (theoretical immune activation)
- ·Immunosuppressants
Supplement interactions
- Vitamin D3 + K2Foundational immune modulation.
- ZincRequired cofactor for innate and adaptive immune function.
- NAD+ precursor (NMN or NR)Complementary mitochondrial and sirtuin support.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
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Third-party testedIndependently verified Selenium (Selenomethionine) — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.Selenium (Selenomethionine) third party tested NSF
CapsulesPre-measured Selenium (Selenomethionine) capsules — easiest for travel and consistent daily dosing without scoops or scales.Selenium (Selenomethionine) capsules
PowderBulk unflavored Selenium (Selenomethionine) powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.Selenium (Selenomethionine) powder unflavored
Best sellersMost-purchased Selenium (Selenomethionine) products on Amazon — a quick way to see what's reviewed widely before you commit.Selenium (Selenomethionine) best sellerScientific evidence8Show studiesHide studies
Selenium in Hashimoto
Gartner R, et al.
70 Hashimoto patients
Reduced TPO antibodies 40%.
PubMed: Selenium (Selenomethionine) — Reduces thyroid antibodies
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