Optimum Nutrition
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Bladderwrack
Bladderwrack
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Regular price
$12.00 USD
Regular price
Sale price
$12.00 USD
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The full picture
Everything Vyvata knows about this product — the score, the evidence, the FAQ, and where else to find shopper reviews. No hidden data. Every vendor is scored on the same published rubric — no brand can pay for placement. Read the rubric →
45/100
Rejected
Six-dimension breakdown
Evidence
40
Formulation
45
Manufacturing
55
Safety
40
Transparency
45
Sustainability
55
Why this scored 45/100
Bladderwrack is a Prairie Star Botanicals single-ingredient liquid extract containing Bladderwrack (Fucus vesiculosus), positioned for thyroid function support. Bladderwrack is a seaweed source of iodine (variable, often 500-2000 mcg per gram of dried herb). Iodine supplementation is medically valid for iodine deficiency, but bladderwrack's unpredictable iodine content makes it a poor delivery form — it can cause both hypo- and hyperthyroid effects. Also concentrates heavy metals (arsenic, cadmium) from ocean water. Unpredictable iodine dose risks hyperthyroidism and Hashimoto's flares. Heavy-metal contamination risk without third-party testing. Anticoagulant interaction (fucoidan). Prairie Star Botanicals is a small US herbalist line built around locally-harvested (where possible) single-herb liquid extracts. The single-ingredient tincture format is honest — you can see exactly what you're taking. What Prairie Star Botanicals does NOT publish at the product level: third-party certificates of analysis, per-lot heavy-metal or microbial testing, herb-to-menstruum extraction ratios, or standardized marker-compound percentages. That opacity is what caps most of the line at Standard-tier or below in Vyvata's rubric even when the herb itself has real evidence.
Last scored: Full rubric →
Evidence & sources
The Vyvata score's Evidence dimension measures the quality of published RCT support for a product's active ingredients at the label dose. Our source hierarchy: double-blind RCTs in MEDLINE-indexed journals > single-blind RCTs > open-label trials > observational studies > mechanism papers > N=1 case studies (anecdotes). Predatory journals and manufacturer-authored studies without independent replication are weighted down.
Product-specific evidence citations for this item are embedded in the analysis text on the "Analysis" tab. For the full framework and evidence hierarchy, see the methodology page.
How to read the Evidence dimension
- 80–100: Multiple double-blind RCTs in indexed journals directly testing this product OR the exact ingredients at the exact dose.
- 60–79: Single double-blind RCT + supporting ingredient literature at the studied dose.
- 40–59: Open-label trials + ingredient literature; no product-specific double-blind evidence.
- 20–39: Ingredient literature only; no product-specific trials or trials in predatory venues.
- 0–19: No credible evidence base or unverifiable claims.
FAQ data has not been generated for this product yet. See the site FAQ for general questions.
Customer reviews
Reviews on other platforms
The Vyvata score measures product integrity against a published rubric, not customer sentiment. Vyvata does not aggregate, republish, or license third-party reviews — the links below open search pages on their respective platforms.
All the data we have on this product
Every VSF-related metafield surfaced verbatim. Nothing hidden. If you spot data that looks wrong, let us know.
- VSF score
- 45 / 100
- Tier
- Rejected
- Category
- Supplements
- Subcategory
- hormonal endocrine
- Last scored
- Third-party certifications
- None on record at time of scoring
- Vendor
- Prairie Star Botanicals
- Product type
- Singles
- Tags
- Prairie Star Botanicals, Shopify Collective
Every score is set from the published rubric, audit-logged, and rescored whenever new evidence emerges (published trials, updated labels, third-party testing releases). Every vendor is scored on the same criteria — no pay-to-play. See our editorial-independence disclosure for the full policy, including brands with an editorial relationship to this site.
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