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Organic Kelp

NOW
4.7
★ ★ ★ ★ ★
(1942 ratings)
Iodine 450 mcg
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Score83
A focused iodine option with an organic whole-seaweed source with flexible measurement. Its value is mainly for inadequate intake, while the amount exceeds basic maintenance needs and natural kelp can vary.
How scoring works
Quantity:8 Liquid(s) • (2522 servings)
Goals:
Metabolism Boost
Energy

Score 83

A focused iodine option with an organic whole-seaweed source with flexible measurement. Its value is mainly for inadequate intake, while the amount exceeds basic maintenance needs and natural kelp can vary.
How scoring works
$9.90($0.00 per serving)
Daily Vita
$ 9.90
iHerb
$ 10.40
Pure Formulas
$ 10.11
Vitacost
$ 10.23
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Analysis

The formula delivers 450 mcg from organic kelp in a liquid. An organic whole-seaweed source with flexible measurement.

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 exceeds basic maintenance needs and natural kelp can vary. The product is most sensible for adults who prefer liquid kelp and have a defined iodine need, with total iodine intake considered before regular use.

Who is it for
  • adults who prefer liquid kelp and have a defined iodine need
  • 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 450 mcg
  • An organic whole-seaweed source with flexible measurement
  • Liquid keeps use straightforward

Cons

  • The amount exceeds basic maintenance needs and natural kelp can vary
  • Benefits are conditional on inadequate iodine intake
  • Whole-seaweed iodine can be less consistent than purified iodide

Warnings

  • The 450 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

77 High impact

Organic kelp supports source quality and the amount is meaningful. The above-maintenance amount leaves less room for iodine from food.

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Ingredient transparency

86 Highest impact

Iodine and organic kelp amounts are clearly listed. Exact liquid directions, the carrier base, and inactive ingredients are missing.

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Customer satisfaction

72 High impact

The supplied average rating is strong and backed by a 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

Organic kelp supplies 450 mcg iodine for thyroid-hormone production and metabolic regulation. The amount is above routine daily needs but remains below the adult upper limit.

Extra iodine will not boost metabolism when intake and thyroid function are already adequate. People with thyroid disease or taking thyroid medication should avoid unsupervised use because excess iodine can alter thyroid control.

Study evidence
Iodine Mixed 17 studies
Energy
Impact
High effect
C Goal FitB- Strength of SupportD CoverageA- Formula Quality
Iodine · 450 mcg

Organic kelp supplies iodine for thyroid hormone production, creating an indirect and conditional link to energy. Benefit is most plausible when iodine intake is inadequate.

The 450 mcg amount is above basic maintenance needs and may be unsuitable for some thyroid conditions. Natural kelp can also vary in iodine content, so combining it with other iodine supplements deserves caution.

Study evidence
Iodine Adverse 3 studies

Ingredients

IngredientAmount per serving
Iodine
450 mcg
organic Kelp
90 mg
Gluten Free Adults 18–50 Vegan Kosher Dairy Free Organic Vegetarian
Report overview
Iodine · 450 mcg OverallScore90
A Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyA+ Value

Organic kelp provides a clearly stated iodine amount with a stronger purity marker than generic seaweed. The dose is above the basic maintenance range but stays below the upper intake limit. The scoop format allows flexible use, and the cost per serving is exceptionally low.

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Sources

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

  1. 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
  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. 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
  4. 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
  5. 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
  6. 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
  7. 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
  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. Urinary Iodine Concentration and Thyroid Hormone Metabolism in Pregnant Women and Neurodevelopment in Their Children: A Longitudinal Canadian Birth Cohort.
    Berghuis SA; Hall M; Krzeczkowski JE; Goodman CV; Chevrier J; Ayotte P; Lanphear B; Till C · Nutrients · 2025
    Cohort study1,501 participantsMetabolism Boost forIodine
  11. A study on the differences in urinary iodine and serum iodine in relation to children's iodine nutrition and lipids.
    Zhang Y; Xu L; Wang L; Gao H; Hao J; Dong L; Qiu L; Wang J; Yan S; Liu L · Lipids in health and disease · 2026
    Cross-sectional studyMetabolism Boost forIodine
  12. Serum Manganese, Cobalt, Copper, Zinc, Selenium, and Iodine Levels, and the Incidence of Type 2 Diabetes: A Nested Case-control Study.
    Ito A; Yamamoto S; Iwai-Shimada M; Kobayashi Y; Isobe T; Iwai K; Nakayama SF; Konishi M; Watanabe Y; Yamamoto S; Nakagawa T; Yamazaki S; Mizoue T · Biological trace element research · 2026
    Case-control study936 participantsMetabolism Boost forIodine
  13. 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
  14. 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