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Kelp

NOW
4.8
★ ★ ★ ★ ★
(10464 ratings)
Iodine 325 mcg
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Score86
A focused iodine option with a simple one-ingredient formula with a named whole-food source. Its value is mainly for inadequate intake, while the amount is higher than basic daily maintenance needs.
How scoring works
Quantity:250 Capsule(s) • (250 servings)
Goals:
Metabolism Boost
Energy

Score 86

A focused iodine option with a simple one-ingredient formula with a named whole-food source. Its value is mainly for inadequate intake, while the amount is higher than basic daily maintenance needs.
How scoring works
$11.60($0.04 per serving)
Vitacost
$ 13.13
Daily Vita
$ 11.60
Amazon
$ 11.60
iHerb
$ 12.24
Pure Formulas
$ 11.89
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Analysis

The formula delivers 325 mcg from organic kelp in a capsule. A simple one-ingredient formula with a named whole-food source.

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 the amount is higher than basic daily maintenance needs. The product is most sensible for adults with inadequate iodine intake who prefer kelp, with total iodine intake considered before regular use.

Who is it for
  • adults with inadequate iodine intake who prefer kelp
  • 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 325 mcg
  • A simple one-ingredient formula with a named whole-food source
  • Capsule keeps use straightforward

Cons

  • The amount is higher than basic daily maintenance needs
  • Benefits are conditional on inadequate iodine intake
  • Whole-seaweed iodine can be less consistent than purified iodide

Warnings

  • The 325 mcg amount is above basic maintenance needs; account for iodine from food and other supplements.
  • Do not stack it with kelp, iodine drops, or an iodine-containing multivitamin.
  • People with autoimmune thyroid disease, thyroid nodules, or thyroid-medicine use should obtain condition-specific guidance.

Nutrient quality

84 Highest impact

Organic kelp offers useful source quality and a meaningful iodine amount. The amount is somewhat aggressive for routine maintenance despite remaining below the adult upper level.

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Ingredient transparency

87 Highest impact

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

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Customer satisfaction

73 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

Metabolism Boost
Impact
High effect
B Goal FitB Strength of SupportD+ CoverageA+ Formula Quality

Iodine supports thyroid-hormone production and may normalize metabolism when iodine intake is inadequate. The serving is higher than basic daily needs, so it is not a general-purpose way to accelerate a normal thyroid.

Organic kelp and the iodine amount are clearly disclosed. The formula remains narrow and does not support glucose regulation, mitochondria, or thermogenesis.

Study evidence
Iodine Mixed 17 studies
Energy
Impact
High effect
B- Goal FitB+ Strength of SupportD+ CoverageA Formula Quality
Iodine · 325 mcg

Organic kelp supplies iodine for thyroid hormone production and normal metabolic rate. The higher-than-maintenance amount may help only when iodine intake is inadequate and is not an acute energy aid.

The capsule provides a single, clearly measured pathway rather than broad energy coverage. People with autoimmune thyroid disease, thyroid nodules, or thyroid-hormone treatment should have this amount reviewed because excess iodine can destabilize thyroid control.

Study evidence
Iodine Adverse 3 studies

Ingredients

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

Organic kelp provides a clearly sourced whole-food iodine form, but the 325 mcg dose is higher than needed for basic daily maintenance. The amount remains below the adult upper limit and is clearly stated per capsule. Its low serving cost is attractive, though people seeking a standard daily dose may prefer a lower-strength option.

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Sources

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

  1. Iodine deficiency and real-life supplementation ineffectiveness in Polish pregnant women and its impact on thyroid metabolism.
    Filipowicz D; Szczepanek-Parulska E; Mikulska-Sauermann AA; Karaźniewicz-Łada M; Główka FK; Szymanowski K; Ołtarzewski M; Schomburg L; Ruchała M · Frontiers in endocrinology · 2023
    Cross-sectional study91 participantsMetabolism Boost forIodine
  2. U-Shaped Associations Between Urinary Iodine Concentration and the Prevalence of Metabolic Disorders: A Cross-Sectional Study.
    Jin M; Zhang Z; Li Y; Teng D; Shi X; Ba J; Chen B; Du J; He L; Lai X; Teng X; Li Y; Chi H; Liao E; Liu C; Liu L; Qin G; Qin Y; Quan H; Shi B; Sun H; Tang X; Tong N; Wang G; Zhang JA; Wang Y; Xue Y; Yan L; Yang J; Yang L; Yao Y; Ye Z; Zhang Q; Zhang L; Zhu J; Zhu M; Ning G; Mu Y; Zhao J; Teng W; Shan Z · Thyroid : official journal of the American Thyroid Association · 2021
    Cross-sectional study51,795 participantsMetabolism Boost forIodine
  3. The relationship between excessive iodine during pregnancy and adverse pregnancy complications.
    Li S; Zha H; Cui Y; Sun L; Yu L; Yuan Q · Endocrine · 2025
    Cohort study595 participantsMetabolism Boost 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. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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