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Iodine 500 mcg

Solaray
4.8
★ ★ ★ ★ ★
(1988 ratings)
Iodine 500 mcg
Product Image
Score79
A reliable iodine form and clear dose are positives, though 500 mcg is higher than routine maintenance requires.
How scoring works
Quantity:30 VegCap(s) • (30 servings)
Goals:
Energy
Metabolism Boost

Score 79

A reliable iodine form and clear dose are positives, though 500 mcg is higher than routine maintenance requires.
How scoring works
$9.89($0.32 per serving)
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$ 9.89
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$ 9.89
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Analysis

Potassium iodide is a stable, well-understood iodine form, and the label clearly states its elemental yield. The single-ingredient capsule makes total intake easy to calculate.

A 500 mcg serving is more than most people need for daily maintenance. The higher amount increases the chance of thyroid disruption in susceptible users, especially when food or other supplements also contribute iodine.

Adults following a defined higher-dose plan may value the clean format. For ordinary nutrition, a 150 mcg option offers a more conservative fit.

Who is it for
  • Adults following a defined higher-iodine plan
  • People wanting potassium iodide rather than kelp
  • Users seeking a single-ingredient capsule
Best for
  • Focused iodine supplementation
  • Clearly quantified iodine intake
  • Short or guided higher-dose use

Pros

  • Uses potassium iodide
  • Clearly states elemental amount
  • Simple single-active design

Cons

  • Amount exceeds maintenance needs
  • No lower-dose flexibility
  • Narrow formula offers no supporting nutrients

Warnings

  • The 500 mcg amount may disrupt thyroid function in people with Hashimoto’s disease, Graves’ disease, nodules, or other thyroid disorders.
  • Users of levothyroxine, antithyroid medicine, or amiodarone should not add this iodine amount without individualized guidance.
  • Kelp, seaweed, and other iodine supplements can raise total intake substantially when combined with this capsule.

Nutrient quality

76 High impact

Potassium iodide is stable, water-soluble, and reliably absorbed. The iodine amount is several times basic maintenance needs but remains below the adult upper limit, while extra iodine may disrupt thyroid function in people with autoimmune thyroid disease, nodules, or thyroid medication use.

Ingredient transparency

81 Highest impact

The iodine form and elemental amount are specific and clear. Serving totals are apparent, but full directions and inactive ingredients are not supplied.

Customer satisfaction

70 High impact

The supplied average rating is strong. A large rating base gives the average good reliability, while complaint and firsthand experience details are unavailable.

Value for money

85 Highest impact

Formula quality supports the asking position well. The serving value is highly competitive within the category.

Report analysis

Goals

Energy
Energy
Impact
High effect
B Goal FitB- Strength of SupportD+ CoverageA Formula Quality
Iodine · 500 mcg

Iodine supports thyroid hormone production and can help metabolic energy when intake is inadequate. Potassium iodide provides a clear and predictable mineral form.

The 500 mcg amount is higher than routine daily needs and the formula offers no other energy pathway. Excess iodine can disrupt thyroid function, especially in people with autoimmune thyroid disease or those using thyroid medicines.

Study evidence
Iodine Adverse 3 studies
Metabolism Boost
Metabolism Boost
Impact
High effect
C Goal FitB- Strength of SupportD CoverageA Formula Quality

Iodine directly supports thyroid hormone production, making it relevant when iodine intake is low. The 500 mcg amount is several times the adult daily requirement and offers no benefit for metabolic rate when iodine status is already adequate.

Potassium iodide is a clear and dependable form, and the single-ingredient label is transparent. Extra iodine can worsen some thyroid conditions or interfere with thyroid management, so people with Hashimoto disease, Graves disease, thyroid nodules, or levothyroxine use should review this dose specifically.

Study evidence
Iodine Mixed 17 studies

Ingredients

IngredientAmount per serving
Iodine (Potassium Iodide)
 500 mcg
Adults 18–50
Report overview
Iodine (Potassium Iodide) · 500 mcg OverallScore90
A+ Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyB+ Value
Potassium iodide is stable, water-soluble, and readily absorbed. 500 mcg is above basic maintenance needs but remains below the upper intake limit. The label clearly states the active iodine amount. Per-serving cost falls in the low-cost tier without a qualifying cofactor adjustment.
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87 Performance

Potassium Iodide Iodine 150 mcg

NaturesPlus
<p>The ingredient profile provides 150 mcg of iodine as potassium iodide; compared with the original, the 150 mcg iodine amount is lower than the original 500 mcg and the predictable potassium-iodide form is retained. It supports thyroid-related energy only when intake is inadequate and does not address other energy pathways.</p>
79 Performance

Ionic Iodine from Potassium Iodide 225 mcg

Trace Minerals Research
<p>The ingredient profile provides 225 mcg of iodine as potassium iodide; compared with the original, the 225 mcg iodine amount is lower than the original 500 mcg and the predictable potassium-iodide form is retained. Potassium iodide provides a stable, readily absorbed source at a practical routine amount, while the undisclosed trace-mineral mixture slightly reduces clarity.</p>
75 Performance

Potassium Plus Iodine

NOW
<p>The ingredient profile provides 225 mcg of iodine as potassium iodide plus 99 mg of potassium; compared with the original, the 225 mcg iodine amount is lower than the original 500 mcg and the predictable potassium-iodide form is retained. Potassium iodide provides a useful iodine dose, but the potassium amount is too small to serve as meaningful potassium supplementation.</p>
83 Budget

Organic Kelp

NOW
<p>The lower serving cost provides 450 mcg of iodine from organic kelp; compared with the original, the iodine amount stays close to the original at 450 mcg and the formula remains focused on iodine. Organic kelp offers a useful purity signal and flexible liquid use, but the iodine amount is above basic maintenance needs.</p>
77 Budget

Nascent Iodine

Harmonic Innerprizes
<p>The lower serving cost provides 450 mcg of iodine; compared with the original, the iodine amount stays close to the original at 450 mcg and the formula remains focused on iodine. The liquid provides flexible dosing and an assertive iodine amount below the adult upper level, but the iodine form is not identified in the supplied facts.</p>
87 Budget

North Atlantic Kelp

Solgar
<p>The lower serving cost provides 200 mcg of iodine from Atlantic kelp; compared with the original, the 200 mcg iodine amount is lower than the original 500 mcg and the formula remains focused on iodine. The appropriate dose and very low serving cost create excellent practical value.</p>
88 Value

Arctic-Kelp 225 mcg

Country Life
<p>The favorable balance of serving cost and formulation provides 225 mcg of iodine from Arctic kelp; compared with the original, the 225 mcg iodine amount is lower than the original 500 mcg and the formula remains focused on iodine. The appropriate dose and very low serving cost create excellent practical value.</p>
87 Value

Kelp

Swanson
<p>The favorable balance of serving cost and formulation provides 225 mcg of iodine from Atlantic kelp; compared with the original, the 225 mcg iodine amount is lower than the original 500 mcg and the formula remains focused on iodine. The appropriate dose and very low serving cost create excellent practical value.</p>
86 Value

Kelp

NOW
<p>The favorable balance of serving cost and formulation provides 325 mcg of iodine from organic kelp; compared with the original, the 325 mcg iodine amount is lower than the original 500 mcg and the formula remains focused on iodine. Organic kelp provides a useful whole-food iodine source, but its amount is higher than basic daily maintenance needs.</p>
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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Association of radioactive iodine treatment with survivorship symptoms and primary care utilisation in women of reproductive age with thyroid cancer: a retrospective cohort study.
    Devanarayan P; Hartman M; Partin M · Family medicine and community health · 2026
    Cohort study10,882 participantsEnergy forIodine
  2. Energy level and fatigue after surgery for thyroid cancer: A population-based study of patient-reported outcomes.
    Hughes DT; Reyes-Gastelum D; Kovatch KJ; Hamilton AS; Ward KC; Haymart MR · Surgery · 2020
    Cohort study2,584 participantsEnergy forIodine
  3. Health-Related Quality of Life in Differentiated Thyroid Cancer Survivors: A Cross-Sectional Study From Turkey.
    Gültekin A; Kahraman MY; Şengöz T; Şimşek FS · Head & neck · 2026
    Cross-sectional study202 participantsEnergy forIodine
  4. Iodine Supplementation Decreases Hypercholesterolemia in Iodine-Deficient, Overweight Women: A Randomized Controlled Trial.
    Herter-Aeberli I; Cherkaoui M; El Ansari N; Rohner R; Stinca S; Chabaa L; von Eckardstein A; Aboussad A; Zimmermann MB · The Journal of nutrition · 2015
    Randomized trial163 participantsMetabolism Boost forIodine
  5. Effect of oral iodized oil on thyroid size and thyroid hormone metabolism in children with concurrent selenium and iodine deficiency.
    Zimmermann MB; Adou P; Torresani T; Zeder C; Hurrell RF · European journal of clinical nutrition · 2000
    Single-arm trial51 participantsMetabolism Boost forIodine
  6. Serum Iodine Concentration as a Biomarker for Individual Iodine Nutrition and Thyroid Function in Pregnant Women: A Cross-Sectional Study in Hubei Province.
    Xu M; Dai X; Wang Z; Guo C; Zhang B; Guo H · Public health nutrition · 2026
    Cross-sectional study1,197 participantsMetabolism Boost forIodine
  7. Iron status influences the efficacy of iodine prophylaxis in goitrous children in Côte d'Ivoire.
    Zimmermann MB · International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition · 2002
    OtherMetabolism Boost forIodine
  8. Persistence of goiter despite oral iodine supplementation in goitrous children with iron deficiency anemia in Côte d'Ivoire.
    Zimmermann M; Adou P; Torresani T; Zeder C; Hurrell R · The American journal of clinical nutrition · 2000
    Non-randomized trial109 participantsMetabolism Boost forIodine