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Kelp Thallus

Nature's Answer
4.8
★ ★ ★ ★ ★
(1185 ratings)
Iodine 150 mcg
Ascophyllum nodosum 250 mg
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Score85
A focused iodine option with a maintenance-level iodine amount from 250 mg of kelp. Its value is mainly for inadequate intake, while clean-water sourcing and contaminant controls are not described.
How scoring works
Quantity:100 Capsule(s) • (100 servings)
Goals:
Energy

Score 85

A focused iodine option with a maintenance-level iodine amount from 250 mg of kelp. Its value is mainly for inadequate intake, while clean-water sourcing and contaminant controls are not described.
How scoring works
$10.49($0.10 per serving)
Pure Formulas
$ 10.72
iHerb
$ 10.49
Vitacost
$ 10.49
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Analysis

The formula delivers 150 mcg from kelp thallus in a capsule. A maintenance-level iodine amount from 250 mg of kelp.

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 clean-water sourcing and contaminant controls are not described. The product is most sensible for adults seeking moderate iodine from whole kelp, with total iodine intake considered before regular use.

Who is it for
  • adults seeking moderate iodine from whole 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 150 mcg
  • A maintenance-level iodine amount from 250 mg of kelp
  • Capsule keeps use straightforward

Cons

  • Clean-water sourcing and contaminant controls are not described
  • 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

89 Highest impact

The iodine amount is well aligned with routine maintenance. Missing organic or clean-water sourcing reduces confidence in kelp purity.

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Ingredient transparency

85 Highest impact

Iodine and kelp amounts are individually disclosed. Marine purity evidence, inactive ingredients, and complete directions are missing.

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Customer satisfaction

73 High impact

The supplied average rating is very 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

94 Highest impact

The suitable dose and useful source justify the low relative cost. The appropriate dose and low serving cost support strong practical value.

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Report analysis

Goals

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

Iodine supports thyroid hormone production and can improve fatigue when inadequate intake contributes to low thyroid function. The kelp source provides a routine daily iodine amount with clear disclosure.

Kelp sourcing lacks clean-water or contaminant-control detail, and iodine is not an acute energy booster. People with thyroid disease or those using thyroid medication need individualized iodine guidance because extra intake can worsen some thyroid conditions.

Study evidence
Iodine Adverse 3 studies

Ingredients

IngredientAmount per serving
Iodine (Kelp)
 150 mcg
Kelp
250 mg
Adults 18–50
Report overview
Iodine (Kelp) · 150 mcg OverallScore86
C+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

Kelp supplies iodine in a useful whole-food form, and the amount suits routine daily support. The lack of organic or clean-water sourcing leaves contaminant control uncertain. Low serving cost makes it a practical daily option.

View ingredientView products
Loading alternative details
88 Performance

Kelp

NOW
<p>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 seaweed-based approach is retained. Organic kelp supplies a standard maintenance amount with useful sourcing detail, though natural seaweed variation remains a limitation.</p>
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>
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>
79 Budget

Iodine 325 mcg

Nutricost
<p>The lower serving cost provides 325 mcg of iodine from kelp; compared with the original, the 325 mcg iodine amount is higher than the original 150 mcg and the seaweed-based approach is retained. The amount exceeds basic maintenance, while missing harvest and purity details reduce confidence for routine use.</p>
87 Value

North Atlantic Kelp

Solgar
<p>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 seaweed-based approach is retained. 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 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 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