Selenium-Iodine Synergy (note)
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Selenium-Iodine Synergy (note). See individual selenium and iodine entries; balance is critical for thyroid health.
How it works. Iodine = thyroid hormone substrate; selenium = activator and GPx cofactor in thyroid.
What the research supports. 1 graded claims. Strongest: Combined adequacy supports thyroid function (strong).
How much to take. Typical dose: 150 mcg iodine + 100–200 mcg selenium.
Side effects and interactions. 1 medication interaction listed. Serious: Discontinue and seek medical advice if symptoms are severe, persistent, or include difficulty breathing.
Stacking. Pairs well with A high-quality multivitamin, Omega-3 (EPA/DHA).
Common forms. Available as Chelated form (glycinate, bisglycinate, citrate, malate), Inorganic salt (oxide, sulfate, chloride), Liquid ionic solution, Topical or transdermal preparation.
Key studies. 8 studies cited. The strongest are listed with links to PubMed.
Community. Experiences from people who have tried Selenium-Iodine Synergy (note). Anecdotes are not medical advice.
Selenium-Iodine Synergy (note). See individual selenium and iodine entries; balance is critical for thyroid health.
What it is
Iodine is the substrate for T4/T3; selenium activates these via deiodinases. Imbalance worsens Hashimoto's.
Food sources
Goals
How it works
Iodine = thyroid hormone substrate; selenium = activator and GPx cofactor in thyroid.
Pathways
- Thyroid hormone synthesis and activation
Effects
- +Combined adequacy supports thyroid function supports
What the research supports
Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.
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Side effects & interactions
Common side effects
- Selenium-Iodine Synergy (note) is generally well-tolerated at evidence-based doses
- Mild GI discomfort (nausea, loose stools, or bloating) possible at higher intakes
- Headache or transient fatigue reported by a small fraction of users
Serious
- Discontinue and seek medical advice if symptoms are severe, persistent, or include difficulty breathing
Medication interactions
Always disclose Selenium-Iodine Synergy (note) use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.
Check any supplement–medication combination with your pharmacist before starting.
Combines with
Pairs well
- A high-quality multivitaminCovers micronutrient cofactors that support most supplement pathways.
- Omega-3 (EPA/DHA)Foundational anti-inflammatory support that complements most regimens.
Common forms
- Chelated form (glycinate, bisglycinate, citrate, malate)
- Inorganic salt (oxide, sulfate, chloride)
- Liquid ionic solution
- Topical or transdermal preparation
Key studies
8 studies cited in total.
Opens current human and preclinical literature matching Selenium-Iodine Synergy (note) and "Combined adequacy supports thyroid function". Filter by RCT, meta-analysis, or year on the results page.
Opens current human and preclinical literature matching Selenium-Iodine Synergy (note) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.
Opens current human and preclinical literature matching Selenium-Iodine Synergy (note) and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.
Discussion
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