Overview
Halogen essential for thyroid hormone synthesis.
- Iodized salt
- Seaweed
- Dairy
- Eggs
- Potassium iodide
- Kelp
- Lugol's solution
Forms & variants of Iodine
Different chemical forms of Iodine behave differently. Browse each form's mechanism, bioavailability, and best-use context.
Mechanism of action
Incorporated into thyroglobulin to form T4 and T3.
- · Thyroid hormone synthesis
Effects on the body
Organ system effects
Required for T3/T4; deficiency causes goiter.
Evidence-based benefits
Prevents goiter and cretinism in deficient populations
Strong evidencePotential side effects
- · Acne flare
- · Hypo- or hyperthyroidism at extreme doses
Drug interactions
Supplement interactions
- A high-quality multivitaminCovers micronutrient cofactors that support most supplement pathways.
- Omega-3 (EPA/DHA)Foundational anti-inflammatory support that complements most regimens.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
Affiliate links — we may earn a commission at no extra cost to you. Amazon code supplementsch-20 is auto-applied at checkout. We don't endorse specific brands; verify third-party testing (USP, NSF, Informed Sport) before purchase.
Third-party testedIndependently verified Iodine — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.Iodine third party tested NSF
CapsulesPre-measured Iodine capsules — easiest for travel and consistent daily dosing without scoops or scales.Iodine capsules
PowderBulk unflavored Iodine powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.Iodine powder unflavored
Best sellersMost-purchased Iodine products on Amazon — a quick way to see what's reviewed widely before you commit.Iodine best sellerScientific evidence8Show studiesHide studies
Iodine: pharmacology, clinical evidence, and safety — narrative review
Examine.com Research Team
Curated narrative review of human and preclinical evidence for Iodine, including mechanism, typical dosing, and safety considerations.
Best-supported outcome: Prevents goiter and cretinism in deficient populations (evidence: strong). Additional outcomes and limitations summarized in the full profile.
PubMed: Iodine — Prevents goiter and cretinism in deficient populations
Live PubMed search
Live results for "Iodine Prevents goiter and cretinism in deficient populations" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Iodine and "Prevents goiter and cretinism in deficient populations". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Iodine — randomized controlled trial
Live PubMed search
Live results for "Iodine randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Iodine and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Iodine — meta-analysis
Live PubMed search
Live results for "Iodine meta-analysis" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Iodine and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Iodine — pharmacokinetics
Live PubMed search
Live results for "Iodine pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Iodine and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Iodine — safety adverse events
Live PubMed search
Live results for "Iodine safety adverse events" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Iodine and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Iodine — dose response
Live PubMed search
Live results for "Iodine dose response" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Iodine and "dose response". Filter by RCT, meta-analysis, or year on the results page.
Google Scholar: Iodine — clinical evidence
Live Scholar search
Cross-database citation index for Iodine as it relates to "clinical evidence".
Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.