Bladderwrack Leaves

Bladderwrack Leaves

Swanson Superior Herbs4.7 (125 ratings)
Format:Capsule Quantity: 60 Capsule(s) · 60 servings
Goals
$10.89 $0.18 per serving
iHerbLowest$0.00iHerb$10.89

About this product

The formula delivers 150 mcg from bladderwrack in a capsule. A routine iodine amount from a whole-seaweed 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 sourcing and contaminant-control details are not supplied. The product is most sensible for adults who prefer a bladderwrack-based iodine source, with total iodine intake considered before regular use.

Who is it for
  • adults who prefer a bladderwrack-based iodine source
  • 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
  • A routine iodine amount from a whole-seaweed source
  • Capsule keeps use straightforward

Cons

  • Sourcing and contaminant-control details are not supplied
  • 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.

Product analysis

82 out of 100
A focused iodine option with a routine iodine amount from a whole-seaweed source. Its value is mainly for inadequate intake, while sourcing and contaminant-control details are not supplied.

AI assessment of the formula, label and price. How scoring works

Nutrient quality86

The iodine amount is well targeted for routine support. Missing clean-water or organic sourcing and extract detail reduce confidence in bladderwrack quality.

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Ingredient transparency83

Iodine and bladderwrack extract amounts are individually shown. Extraction detail, marine purity evidence, inactive ingredients, and complete directions are missing.

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Customer satisfaction67

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

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Value for money89

The useful dose and source broadly justify the relative cost. The useful dose and modest serving cost support good value.

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Format
Capsule
Container
60 Capsule(s)
Per serving
$0.18
Customer rating
4.7 · 125 ratings
Report analysis

Goals

Energy
Energy
Impact
Lower effect
B+ Ingredient FitF PathwaysF EvidenceA+ Formulation Logic
Iodine · 150 mcg
Study evidence
Iodine Adverse 3 studies
Metabolism Boost
Metabolism Boost
Impact
Moderate effect
C Ingredient FitF PathwaysD+ EvidenceA+ Formulation Logic
Study evidence
Iodine Mixed 17 studies

Ingredients

IngredientAmount per servingScore
Iodine (Bladderwrack)
 150 mcg 74
Bladderwrack leaf extract (Iodine)
 75 mg
Adults 18–50
Report overview
Iodine (Bladderwrack) · 150 mcg OverallScore74
F Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value
Bladderwrack Leaves supplies a clearly stated 150 mcg of iodine, within the preferred daily range and below the stated upper intake limit. Its marine origin is identified, but the chemical form is unknown. Organic status or geographic sourcing details aren't established in the available information. The cost per serving is low.
How this ingredient is rated

Active Ingredient Quality & Bioavailability34

The iodine's marine origin is known, but its chemical form remains unclear. Organic status or geographic sourcing details aren't established in the available information.
Iodine Form & Bioavailability
The chemical form isn't identified; knowing the marine origin doesn't resolve which iodine compound it contains.
Marine Source Purity & Sourcing
The marine source lacks established organic status or geographic sourcing details in the available information, leaving its sourcing less clear.

Dose, Safety & Label Transparency100

The clearly stated 150 mcg iodine serving fits the preferred 150–300 mcg daily range and is below the stated upper intake limit.
Dosage Efficacy for Daily Support
The 150 mcg iodine serving falls within the preferred 150–300 mcg daily range.
Dosage Safety & Upper Limits
The 150 mcg serving is below the stated 1,100 mcg upper intake limit.
Elemental Iodine Transparency
The iodine amount is clearly stated, rather than just the weight of its source.

Value100

The cost per serving is low.
Price Per Effective Serving
The cost per serving is low.
View ingredientView products
Loading alternative details
83 Performance

Bladderwrack Whole Thallus 580 mg

Nature's Way

The ingredient profile provides 232 mcg of iodine with 580 mg of whole bladderwrack; compared with the original, the 232 mcg iodine amount is higher than the original 150 mcg and the bladderwrack-based approach is retained. Bladderwrack provides a useful iodine amount, but the source lacks organic or clean-water verification and the whole-thallus material is not standardized.

88 Performance

Kelp

NOW

The ingredient profile provides 150 mcg of iodine from organic kelp; compared with the original, the iodine amount stays close to the original at 150 mcg and the formula remains focused on iodine. Organic kelp supplies a standard maintenance amount with useful sourcing detail, though natural seaweed variation remains a limitation.

88 Performance

Arctic-Kelp 225 mcg

Country Life

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 formula remains focused on iodine. The appropriate dose and very low serving cost create excellent practical value.

87 Budget

Potassium Iodide Iodine 150 mcg

NaturesPlus

The lower serving cost provides 150 mcg of iodine as potassium iodide; compared with the original, the iodine amount stays close to the original at 150 mcg and the formula remains focused on iodine. It supports thyroid-related energy only when intake is inadequate and does not address other energy pathways.

85 Budget

Kelp Thallus

Nature's Answer

The lower serving cost provides 150 mcg of iodine from kelp; compared with the original, the iodine amount stays close to the original at 150 mcg and the formula remains focused on iodine. Kelp supplies a well-targeted maintenance iodine amount, but marine purity and natural source variability remain uncertain.

81 Budget

Icelandic Kelp

Nature's Life

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 formula remains focused on iodine. The iodine amount is above basic daily needs and can complicate thyroid disease or thyroid medication, so routine use should be deliberate.

87 Value

North Atlantic Kelp

Solgar

The favorable balance of serving cost and formulation 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 formula remains focused on iodine. The appropriate dose and very low serving cost create excellent practical value.

87 Value

Kelp

Swanson

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 formula remains focused on iodine. The appropriate dose and very low serving cost create excellent practical value.

86 Value

Icelandic Kelp

NaturesPlus

The favorable balance of serving cost and formulation 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 formula remains focused on iodine. The focused design offers excellent value for iodine support but does not provide broader energy ingredients.

Report alternatives

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