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Kelp

NOW
4.8
★ ★ ★ ★ ★
(25977 ratings)
Iodine 150 mcg
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Score88
A focused iodine option with an amount close to common daily iodine needs. Its value is mainly for inadequate intake, while whole kelp may vary more naturally than isolated iodide.
How scoring works
Quantity:200 Tablet(s) • (200 servings)
Goals:
Energy

Score 88

A focused iodine option with an amount close to common daily iodine needs. Its value is mainly for inadequate intake, while whole kelp may vary more naturally than isolated iodide.
How scoring works
$7.60($0.03 per serving)
Pure Formulas
$ 7.73
Vitacost
$ 8.57
Daily Vita
$ 7.60
iHerb
$ 7.95
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Analysis

The formula delivers 150 mcg from organic kelp in a tablet. An amount close to common daily iodine needs.

Iodine supports thyroid-hormone production and may help energy or metabolic function when dietary intake is inadequate. It is not a stimulant, and extra iodine is unlikely to improve these goals when thyroid status is already adequate.

The main limitation is that whole kelp may vary more naturally than isolated iodide. The product is most sensible for adults seeking a restrained daily kelp supplement, with total iodine intake considered before regular use.

Who is it for
  • adults seeking a restrained daily kelp supplement
  • people whose diet provides too little iodine
Best for
  • targeted iodine support
  • supporting normal thyroid-hormone production when iodine intake is low

Pros

  • Clearly states an iodine amount of 150 mcg
  • An amount close to common daily iodine needs
  • Tablet keeps use straightforward

Cons

  • Whole kelp may vary more naturally than isolated iodide
  • Benefits are conditional on inadequate iodine intake
  • Whole-seaweed iodine can be less consistent than purified iodide

Warnings

  • Seaweed iodine can vary, so avoid adding another iodine supplement without reviewing total intake.
  • Unstated contaminant controls matter for long-term use of a marine-sourced ingredient.
  • People with autoimmune thyroid disease, thyroid nodules, or thyroid-medicine use should obtain condition-specific guidance.

Nutrient quality

92 Highest impact

Organic kelp offers useful source quality at a well-targeted maintenance amount. Natural iodine variability is the main limitation compared with an isolated iodide salt.

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Ingredient transparency

87 Highest impact

The iodine amount and organic kelp source are clearly identified. Complete tablet ingredients and intake directions are not included in the supplied data.

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Customer satisfaction

74 High impact

The supplied average rating is very strong and backed by a very large review pool. No review text is available to assess recurring complaints or firsthand tolerance and ease of use.

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Value for money

98 Highest impact

The suitable dose and clear source strongly justify the low relative cost. The appropriate dose and very low serving cost create excellent practical value.

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Report analysis

Goals

Energy
Energy
Impact
High effect
B- Goal FitA- Strength of SupportD+ CoverageA Formula Quality
Iodine · 150 mcg

Organic kelp supplies a standard maintenance amount of iodine for thyroid hormone production and normal metabolic rate. It may support energy when iodine intake is inadequate but does not provide an immediate energy effect.

The single-ingredient formula is transparent and avoids unnecessary additions. People with autoimmune thyroid disease, thyroid nodules, or thyroid-hormone treatment should still have iodine intake reviewed because added iodine can alter thyroid control.

Study evidence
Iodine Adverse 3 studies

Ingredients

IngredientAmount per serving
Iodine (organic Kelp)
 150 mcg
Gluten Free Adults 18–50 Vegan Kosher Dairy Free Vegetarian
Report overview
Iodine (organic Kelp) · 150 mcg OverallScore96
A- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

Organic kelp delivers the standard 150 mcg daily iodine amount in one tablet. The active dose and source are clearly disclosed, while organic sourcing addresses an important marine purity concern. The very low serving cost makes it practical, though kelp may vary more naturally than isolated iodide salts.

View ingredientView products
Loading alternative details
88 Performance

Arctic-Kelp 225 mcg

Country Life
<p>The ingredient profile provides 225 mcg of iodine from Arctic kelp; compared with the original, the 225 mcg iodine amount is higher than the original 150 mcg and the seaweed-based approach is retained. The appropriate dose and very low serving cost create excellent practical value.</p>
86 Performance

Icelandic Kelp

NaturesPlus
<p>The ingredient profile provides 150 mcg of iodine from Icelandic kelp; compared with the original, the iodine amount stays close to the original at 150 mcg and the seaweed-based approach is retained. The focused design offers excellent value for iodine support but does not provide broader energy ingredients.</p>
87 Performance

North Atlantic Kelp

Solgar
<p>The ingredient profile provides 200 mcg of iodine from Atlantic kelp; compared with the original, the 200 mcg iodine amount is higher than the original 150 mcg and the seaweed-based approach is retained. The appropriate dose and very low serving cost create excellent practical value.</p>
81 Budget

Icelandic Kelp

Nature's Life
<p>The lower serving cost provides 225 mcg of iodine from Icelandic kelp; compared with the original, the 225 mcg iodine amount is higher than the original 150 mcg and the seaweed-based approach is retained. The iodine amount is above basic daily needs and can complicate thyroid disease or thyroid medication, so routine use should be deliberate.</p>
83 Budget

Organic Kelp

NOW
<p>The lower serving cost provides 450 mcg of iodine from organic kelp; compared with the original, the 450 mcg iodine amount is higher than the original 150 mcg and the seaweed-based approach is retained. Organic kelp offers a useful purity signal and flexible liquid use, but the iodine amount is above basic maintenance needs.</p>
81 Budget

Iodine+

Codeage
<p>The lower serving cost provides 250 mcg of iodine as nascent iodine; compared with the original, the 250 mcg iodine amount is higher than the original 150 mcg and the formula remains focused on iodine. The above-maintenance amount offers no assured metabolic benefit when iodine status is adequate and can complicate thyroid management.</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 higher than the original 150 mcg and the seaweed-based approach is retained. The appropriate dose and very low serving cost create excellent practical value.</p>
85 Value

Kelp Thallus

Nature's Answer
<p>The favorable balance of serving cost and formulation provides 150 mcg of iodine from kelp; compared with the original, the iodine amount stays close to the original at 150 mcg and the seaweed-based approach is retained. Kelp supplies a well-targeted maintenance iodine amount, but marine purity and natural source variability remain uncertain.</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 higher than the original 150 mcg and the seaweed-based approach is retained. Organic kelp provides a useful whole-food iodine source, but its amount is higher than basic daily maintenance needs.</p>
Report alternatives

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