Swanson Bladderwrack Extract supplement bottle
Swanson

Bladderwrack Extract Review

What We Researched
2 active ingredients analyzed · 5 inactive ingredients decoded · 6 brand certifications checked · Last updated: Aug 2026
93
Product Score Excellent
97
Brand Score Excellent

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Iodine (from bladderwrack) 150 mcg 100%
BladderwrackWhole Plant Extract(standardized to 0.2% iodine) 75 mg *
Bioavailability Very Good

Absorption Rating

  • Iodine (from bladderwrack) Good
  • BladderwrackWhole Plant Extract(standardized to 0.2% iodine) Fair
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose (Plant Fiber)
  • Gelatin
  • Calcium Palmitate
  • Maltodextrin
  • Silica
Efficacy Excellent

Dosage Analysis

  • Iodine (from bladderwrack) 150 mcg Effective

Supplement Facts

Ingredient Amount % Daily Value
Iodine (from bladderwrack) 150 mcg 100%
BladderwrackWhole Plant Extract(standardized to 0.2% iodine) 75 mg *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose (Plant Fiber) Safe

It is used as a filler, binder, and disintegrant.

Gelatin Safe

Forms the capsule shell that holds the supplement contents.

Calcium Palmitate Generally_safe

It is used to prevent ingredients from sticking to manufacturing equipment.

Maltodextrin Generally_safe

Helps carry and stabilize active ingredients. Provides bulk.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Brand Trust Report
Swanson

Founded 1969 · Fargo, North Dakota, United States · 1329 products · swansonvitamins.com

Certifications

6 certifications
Nsf Gmp Verified Source
Fda Gmp Inspections Verified Source
Npa Gmp Verified Source
Usda Organic Verified Source
Vegan Certified Verified Source
NSF Certified Verified

Transparency

5 claims
Third Party Testing Claim — Verified Source
Coa Availability — Claimed Source
In House Testing — Verified Source
Testing Lab Disclosure — True
Contains Proprietary Blend — True

Violation History

5 incidents
Recall Vitamin B12 Methylcobalamin High Absorption2022-03-04Source
Prop 65 Lead2015-11-03Source
Recall Swanson Premium Brand Full Spectrum Cilantro (Coriander)2014-04-04Source
Recall Swanson Organic Celery Seed (Whole)2011-12-16Source
Fda Warning Products contained an unauthorized drug (lovastatin) and were marketed with claims to treat high cholesterol, rendering them unapproved new drugs.2007-08-08Source
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Frequently Asked Questions
Is Swanson Bladderwrack Extract a good supplement?

Swanson Bladderwrack Extract received a product quality score of 93/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 2 active ingredients Of the 5 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, Swanson, holds a brand trust score of 97/100 with 6 verified certifications including Nsf Gmp, Fda Gmp Inspections, Npa Gmp, Usda Organic.

What are the ingredients in Swanson Bladderwrack Extract?

Swanson Bladderwrack Extract contains 2 active ingredients: Iodine (from bladderwrack) (150 mcg), BladderwrackWhole Plant Extract(standardized to 0.2% iodine) (75 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Swanson Bladderwrack Extract safe to take?

Swanson Bladderwrack Extract has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Swanson a trustworthy supplement brand?

Swanson receives a brand trust score of 97/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1969 and headquartered in Fargo, North Dakota, United States, the company offers 1329 products in their lineup. They hold 6 verified certifications including Nsf Gmp, Fda Gmp Inspections, Npa Gmp, Usda Organic. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Swanson has 5 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.