Iodine
Also sold as: Potassium iodide · Potassium iodate · Dietary iodine
An essential thyroid-hormone mineral whose clear benefits concern preventing or correcting deficiency. Extra iodine is not an established energy or weight-loss aid when intake is adequate.
Energy
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Research
- Energy: No RCT benefit for extra iodine in iodine-replete adults is established. Correcting documented deficiency is a different clinical situation; excess can impair thyroid function.
REALITY CHECK // Iodized salt and deficiency correction are not evidence for 12.5-50 mg/day iodine protocols. The latter have no supporting RCTs in this dossier; seaweed can supply unpredictable amounts, and more iodine can suppress or overstimulate the thyroid.
Levels: how we grade evidence. Grey = evidence of no benefit; amber = evidence it makes this goal worse.
Ratings are self-reported by a self-selected group of users: how it felt, not proof that it works.
Check your bottle
Compare what your label says with what was used in trials. This is a trial range, not a personal prescription.
Enter the amount from your label to see the result.
How it was studied
01 // STUDIED_DOSE_RANGE
Trial context
The dossier lists adult nutritional intake around 150 micrograms/day (0.15 mg), with higher needs in pregnancy/lactation; these are requirements, not RCT treatment doses. The supplied summary does not establish a general dose interval for efficacy trials. Milligram-dose mastalgia studies and emergency KI are separate supervised indications.
02 // TIMING_&_MATRIX
Form and schedule
Precision of the declared iodine amount matters more than a marketed form or clock time. Nutritional micrograms and medical milligrams are different contexts.
03 // EVALUATION_WINDOW
Outcome-specific follow-up
Deficiency programs and pregnancy studies assess chronic outcomes; emergency radioiodine blocking is a separate acute intervention. Symptoms alone cannot establish iodine status.
04 // SAFETY_&_QUALITY_GATE
Review before use
Hashimoto disease, Graves disease, thyroid nodules/autonomy, pregnancy/lactation, childhood or thyroid-active medication require individualized review. Avoid self-prescribed Lugol/kelp megadoses. Stop and seek assessment for palpitations, marked thyroid symptoms, metallic taste, throat burning, rash or GI irritation; iodine excess can harm the fetal thyroid.
UPPER LIMIT // The dossier quotes adult EFSA 600 micrograms/day and US IOM/NIH 1100 micrograms/day (0.6 and 1.1 mg), but explicitly marks them unverified against live authority sources. Numeric UL fields remain null pending confirmation. Nutritional requirements are not ULs.
Summary
Deficiency correction prevents iodine-deficiency disorders, but excess can induce either hyperthyroidism or hypothyroidism. Pregnancy evidence depends strongly on baseline deficiency; high-dose iodine protocols are unsupported and potentially harmful.
Mechanism
Iodine is required for thyroid-hormone synthesis. Excess may trigger iodine-induced hyperthyroidism in autonomous thyroid tissue or persistent Wolff-Chaikoff suppression; more substrate does not simply mean more healthy metabolism.
Typical studied dose
The dossier lists adult nutritional intake around 150 micrograms/day (0.15 mg), with higher needs in pregnancy/lactation; these are requirements, not RCT treatment doses. The supplied summary does not establish a general dose interval for efficacy trials. Milligram-dose mastalgia studies and emergency KI are separate supervised indications.
Upper limit
The dossier quotes adult EFSA 600 micrograms/day and US IOM/NIH 1100 micrograms/day (0.6 and 1.1 mg), but explicitly marks them unverified against live authority sources. Numeric UL fields remain null pending confirmation. Nutritional requirements are not ULs.
Popular stacks with Iodine
Not enough stack data yet. A combination with Iodine appears here once 5 people rate the same set.
Forms and label traps
| Form on label | Active content | Studied range / day | Absorption & GI tolerance | Verdict |
|---|---|---|---|---|
| Pure potassium iodide (KI) Best for: Checking a known KI compound mass against the declared elemental iodine. |
76.5% elemental / active | no comparable trial range | Predictable high absorption; useful when iodine content is precisely declared. Usually tolerated at nutritional amounts; milligram dosing may cause iodism. |
Studied standard [FORM // REFERENCE] 76.5% is a chemical composition approximation, not absorption. Enter mg, not micrograms; 150 micrograms equals 0.15 mg. No generic trial target is supplied. |
| Pure potassium iodate (KIO3) Best for: Checking iodine content of a precisely declared iodate ingredient. |
59% elemental / active | no comparable trial range | Used in salt-fortification programs; no head-to-head clinical superiority over KI is established. Usually tolerated at nutritional amounts. |
Good option [FORM // GOOD] About 59% iodine by compound mass; never apply this percentage to an entire salt tablet or iodized table salt. |
| Kelp / seaweed / sea moss Best for: Recognizing why raw seaweed mass cannot predict iodine. |
Unstandardized: active content unknown | no comparable trial range | Iodine exposure varies greatly across species and products; some safety evidence is animal-only. Excess iodine and contaminants are concerns. |
Caution [FORM // CAUTION] No universal iodine percentage or raw-material conversion is valid; batch testing and a declared iodine amount are necessary. |
| Lugol solution / molecular or nascent iodine Best for: Flagging concentrated solutions rather than modeling nutritional replacement. |
Unstandardized: active content unknown | no comparable trial range | Absorption is not the central problem: concentrated solutions may deliver milligram doses per drop. Iodism and thyroid dysfunction are concerns with repeated excess. |
Caution [FORM // CAUTION] A nominal 2% I2 solution is not a universal 2% total elemental iodine conversion because KI, density and drop size vary. No reliable bottle-specific conversion is supplied. |
Common label traps
- TRAP_01 // Iodine protocol detoxes and boosts energy
No supporting RCTs are supplied for 12.5-50 mg/day; excess-related thyroid dysfunction is well described. - TRAP_02 // Natural kelp is safer
Iodine content varies widely; thyroid suppression and hyperthyroidism have been reported, and animal work documents contaminant accumulation. - TRAP_03 // Nascent iodine is uniquely superior
No established human absorption or safety advantage is supplied. - TRAP_04 // More iodine means a smarter baby
Severe-deficiency prevention differs from mild-deficiency trials, which have not established consistent neurodevelopmental improvement.
Other outcomes studied
Outside the five leaderboard goals. Same evidence levels as above.
- Iodine-deficiency disorders Moderate · benefit
Systematic reviews of iodized salt support prevention/correction of iodine deficiency and endemic goiter. This benefit concerns deficient populations, not pharmacological excess.
PMID 12137681 PMID 12227127 PMID 19460960 - Severe maternal deficiency Moderate · benefit
Correction of severe deficiency prevents profound deficiency-related developmental disorders; evidence should not be extrapolated to already adequate intake.
PMID 34191411 PMID 19460960 - Mild/moderate deficiency in pregnancy Limited · no benefit
A randomized-trial secondary analysis did not improve maternal thyroid function or child development, and reviews found neurodevelopment evidence inconsistent or insufficient. The dossier IPD association summary needs primary-paper review and is not treated as proof of supplementation benefit or absence thereof.
PMID 33123091 PMID 32320029 PMID 26654905 PMID 24088547 - Excess-related thyroid dysfunction Moderate · makes it worse
Reviews describe iodine-induced hyperthyroidism, hypothyroidism and autoimmune susceptibility, particularly with nodules or preexisting thyroid disease.
PMID 38870258 PMID 22820214 PMID 11396709 PMID 28290237 - Cyclic mastalgia Limited · benefit
Small molecular-iodine studies report breast-pain improvement with supraphysiological doses; limited replication and thyroid risks prevent a self-treatment protocol.
PMID 15239792 PMID 8221402 - Radioiodine emergency blocking Moderate · benefit
Stable iodine/KI can block thyroid uptake of radioactive iodine in an emergency; public-health-directed emergency treatment does not justify daily high-dose supplementation.
PMID 27655110 PMID 11349833 - Energy / weight loss in replete adults No established evidence
No efficacy RCT supports routine iodine boosting in already replete adults; excess kombu suppressed thyroid function in a human study.
PMID 18689954 PMID 38870258 - Seaweed quality Limited · makes it worse
Commercial seaweeds vary markedly in iodine content; kelp-related transient hyperthyroidism is reported. Arsenic/cadmium accumulation evidence cited here is from rats and does not quantify human supplement risk.
PMID 15588380 PMID 31517826 PMID 36553687
Reader questions
Is 150 micrograms always safe?
It is a nutritional-intake reference, not a personal prescription or guarantee. Total intake, thyroid disease, medicines and pregnancy change the decision.
Which form is most predictable?
A precisely labeled KI or iodate product allows a known iodine amount. Kelp and concentrated drops may be much harder to control; no head-to-head superiority on clinical outcomes is established.
Can I use high-dose iodine for detox?
No supporting controlled evidence is supplied. Thyroid toxicity is a real concern; do not self-prescribe milligram protocols.
What if I have Hashimoto disease or take levothyroxine?
Discuss intake and thyroid status with the treating clinician. Iodine is not an automatic fix for hypothyroidism and may worsen autoimmune or autonomous thyroid disease.
How do I test deficiency?
A clinical review of diet, exposure and thyroid status is needed. The supplied dossier does not establish a reliable one-off individual testing algorithm, so a urine or blood result should not trigger megadosing.
Stack interactions
- Caution Thyroid medication / lithium [CAUTION // REVIEW]
Excess iodine can induce both thyroid hyper- and hypofunction and destabilize treatment. Supplementation requires the treating clinician.
PMID 38870258 PMID 22820214 - Caution Amiodarone [CAUTION // REVIEW]
The drug itself provides a substantial iodine load and can cause thyroid dysfunction; additional iodine requires review.
PMID 33159436 PMID 22820214 - Caution Selenium / iron / vitamin A [CAUTION // REVIEW]
Nutritional deficiencies can impair thyroid metabolism; a cofactor stack does not neutralize iodine excess. Review deficiencies individually.
PMID 28290237 - Caution Soy / cruciferous vegetables / millet [CAUTION // REVIEW]
Very high goitrogen exposure may matter when iodine intake is low; ordinary intake with adequate iodine is not established as a reason to megadose.
Red flags: interactions and who should avoid it
Interactions
Levothyroxine, antithyroid drugs, lithium and amiodarone require clinician review because excess iodine can destabilize thyroid control. Selenium, iron and vitamin A status influence thyroid metabolism, but adding cofactors does not make iodine megadoses safe. No established iodine-anticoagulant interaction at nutritional intake is supplied.
Avoid or ask a doctor first if
Hashimoto disease, Graves disease, thyroid nodules/autonomy, pregnancy/lactation, childhood or thyroid-active medication require individualized review. Avoid self-prescribed Lugol/kelp megadoses. Stop and seek assessment for palpitations, marked thyroid symptoms, metallic taste, throat burning, rash or GI irritation; iodine excess can harm the fetal thyroid.
Sources (PubMed, 21)
- Iodised salt for preventing iodine deficiency disorders.
PMID 12137681 · 2002 · systematic review / meta-analysisSystematic reviews of iodized salt support prevention/correction of iodine deficiency and endemic goiter. This benefit concerns deficient populations, not pharmacological excess.
- Iodized salt for iodine deficiency disorders. A systematic review.
PMID 12227127 · 2002 · systematic review / meta-analysisSystematic reviews of iodized salt support prevention/correction of iodine deficiency and endemic goiter. This benefit concerns deficient populations, not pharmacological excess.
- Iodine deficiency.
PMID 19460960 · 2009 · narrative reviewSystematic reviews of iodized salt support prevention/correction of iodine deficiency and endemic goiter. This benefit concerns deficient populations, not pharmacological excess. Correction of severe deficiency prevents profound deficiency-related developmental disorders; evidence should not be extrapolated to already adequate intake.
- Effect of iodine supplementation in pregnancy on neurocognitive development on offspring in iodine deficiency areas: a systematic review.
PMID 34191411 · 2021 · systematic review / meta-analysisCorrection of severe deficiency prevents profound deficiency-related developmental disorders; evidence should not be extrapolated to already adequate intake.
- Iodine Supplementation in Mildly Iodine-Deficient Pregnant Women Does Not Improve Maternal Thyroid Function or Child Development: A Secondary Analysis of a Randomized Controlled Trial.
PMID 33123091 · 2020 · randomized controlled trialA randomized-trial secondary analysis did not improve maternal thyroid function or child development, and reviews found neurodevelopment evidence inconsistent or insufficient. The dossier IPD association summary needs primary-paper review and is not treated as proof of supplementation benefit or absence thereof.
- Systematic review and meta-analysis of the effects of iodine supplementation on thyroid function and child neurodevelopment in mildly-to-moderately iodine-deficient pregnant women.
PMID 32320029 · 2020 · systematic review / meta-analysisA randomized-trial secondary analysis did not improve maternal thyroid function or child development, and reviews found neurodevelopment evidence inconsistent or insufficient. The dossier IPD association summary needs primary-paper review and is not treated as proof of supplementation benefit or absence thereof.
- The effect of iodine supplementation in pregnancy on early childhood neurodevelopment and clinical outcomes: results of an aborted randomised placebo-controlled trial.
PMID 26654905 · 2015 · randomized controlled trialA randomized-trial secondary analysis did not improve maternal thyroid function or child development, and reviews found neurodevelopment evidence inconsistent or insufficient. The dossier IPD association summary needs primary-paper review and is not treated as proof of supplementation benefit or absence thereof.
- Therapy of endocrine disease: Impact of iodine supplementation in mild-to-moderate iodine deficiency: systematic review and meta-analysis.
PMID 24088547 · 2014 · systematic review / meta-analysisA randomized-trial secondary analysis did not improve maternal thyroid function or child development, and reviews found neurodevelopment evidence inconsistent or insufficient. The dossier IPD association summary needs primary-paper review and is not treated as proof of supplementation benefit or absence thereof.
- Risks of Iodine Excess.
PMID 38870258 · 2024 · narrative reviewReviews describe iodine-induced hyperthyroidism, hypothyroidism and autoimmune susceptibility, particularly with nodules or preexisting thyroid disease. No efficacy RCT supports routine iodine boosting in already replete adults; excess kombu suppressed thyroid function in a human study. Excess iodine can induce both thyroid hyper- and hypofunction and destabilize treatment. Supplementation requires the treating clinician.
- Iodine-induced thyroid dysfunction.
PMID 22820214 · 2012 · narrative reviewReviews describe iodine-induced hyperthyroidism, hypothyroidism and autoimmune susceptibility, particularly with nodules or preexisting thyroid disease. Excess iodine can induce both thyroid hyper- and hypofunction and destabilize treatment. Supplementation requires the treating clinician. The drug itself provides a substantial iodine load and can cause thyroid dysfunction; additional iodine requires review.
- Iodine-Induced hypothyroidism.
PMID 11396709 · 2001 · narrative reviewReviews describe iodine-induced hyperthyroidism, hypothyroidism and autoimmune susceptibility, particularly with nodules or preexisting thyroid disease.
- Multiple Nutritional Factors and the Risk of Hashimoto's Thyroiditis.
PMID 28290237 · 2017 · narrative reviewReviews describe iodine-induced hyperthyroidism, hypothyroidism and autoimmune susceptibility, particularly with nodules or preexisting thyroid disease. Nutritional deficiencies can impair thyroid metabolism; a cofactor stack does not neutralize iodine excess. Review deficiencies individually.
- The effect of supraphysiologic levels of iodine on patients with cyclic mastalgia.
PMID 15239792 · 2004 · randomized controlled trialSmall molecular-iodine studies report breast-pain improvement with supraphysiological doses; limited replication and thyroid risks prevent a self-treatment protocol. Absorption is not the central problem: concentrated solutions may deliver milligram doses per drop. A nominal 2% I2 solution is not a universal 2% total elemental iodine conversion because KI, density and drop size vary. No reliable bottle-specific conversion is supplied.
- Iodine replacement in fibrocystic disease of the breast.
PMID 8221402 · 1993 · narrative reviewSmall molecular-iodine studies report breast-pain improvement with supraphysiological doses; limited replication and thyroid risks prevent a self-treatment protocol.
- The effects of iodine blocking on thyroid cancer, hypothyroidism and benign thyroid nodules following nuclear accidents: a systematic review.
PMID 27655110 · 2016 · systematic review / meta-analysisStable iodine/KI can block thyroid uptake of radioactive iodine in an emergency; public-health-directed emergency treatment does not justify daily high-dose supplementation.
- Iodine kinetics and effectiveness of stable iodine prophylaxis after intake of radioactive iodine: a review.
PMID 11349833 · 2001 · narrative reviewStable iodine/KI can block thyroid uptake of radioactive iodine in an emergency; public-health-directed emergency treatment does not justify daily high-dose supplementation. Predictable high absorption; useful when iodine content is precisely declared. 76.5% is a chemical composition approximation, not absorption. Enter mg, not micrograms; 150 micrograms equals 0.15 mg. No generic trial target is supplied.
- Suppression of thyroid function during ingestion of seaweed \"Kombu\" (Laminaria japonoca) in normal Japanese adults.
PMID 18689954 · 2008 · clinical report / other studyNo efficacy RCT supports routine iodine boosting in already replete adults; excess kombu suppressed thyroid function in a human study. Iodine exposure varies greatly across species and products; some safety evidence is animal-only. No universal iodine percentage or raw-material conversion is valid; batch testing and a declared iodine amount are necessary.
- Variability of iodine content in common commercially available edible seaweeds.
PMID 15588380 · 2004 · observational studyCommercial seaweeds vary markedly in iodine content; kelp-related transient hyperthyroidism is reported. Arsenic/cadmium accumulation evidence cited here is from rats and does not quantify human supplement risk. Iodine exposure varies greatly across species and products; some safety evidence is animal-only. No universal iodine percentage or raw-material conversion is valid; batch testing and a declared iodine amount are necessary.
- Transient Hyperthyroidism following the ingestion of complementary medications containing kelp seaweed: A case-report.
PMID 31517826 · 2019 · clinical report / other studyCommercial seaweeds vary markedly in iodine content; kelp-related transient hyperthyroidism is reported. Arsenic/cadmium accumulation evidence cited here is from rats and does not quantify human supplement risk. Iodine exposure varies greatly across species and products; some safety evidence is animal-only. No universal iodine percentage or raw-material conversion is valid; batch testing and a declared iodine amount are necessary.
- Iodine Bioavailability and Accumulation of Arsenic and Cadmium in Rats Fed Sugar Kelp (Saccharina latissima).
PMID 36553687 · 2022 · preclinical animal studyCommercial seaweeds vary markedly in iodine content; kelp-related transient hyperthyroidism is reported. Arsenic/cadmium accumulation evidence cited here is from rats and does not quantify human supplement risk. Iodine exposure varies greatly across species and products; some safety evidence is animal-only. No universal iodine percentage or raw-material conversion is valid; batch testing and a declared iodine amount are necessary.
- Evaluation and Treatment of Amiodarone-Induced Thyroid Disorders.
PMID 33159436 · 2021 · narrative reviewThe drug itself provides a substantial iodine load and can cause thyroid dysfunction; additional iodine requires review.
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