Optimum Nutrition
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Horsetail Capsules
Horsetail Capsules
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Regular price
$19.99 USD
Regular price
Sale price
$19.99 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 →
40/100
Rejected
Six-dimension breakdown
Evidence
32
Formulation
55
Manufacturing
55
Safety
35
Transparency
50
Sustainability
50
Why this scored 40/100
Horsetail Capsules is single-ingredient capsulated Horsetail (Equisetum arvense). Horsetail is used in European folk medicine as a mild diuretic and for its silica content, sometimes marketed for hair, nails, and bones. Costa-Rodrigues 2012 in-vitro work suggests bone-related activity, but no rigorous human RCT for bone-density outcomes. Thiaminase content — historically linked to thiamine deficiency with long-term high-dose use. Avoid E. palustre (contains toxic alkaloids). Look for thiaminase-free (heat-treated) preparations for long use. Traditional use plus documented safety concerns. Garden Organics is a small US-based single-ingredient herbal line; every product is one botanical in capsule or tincture form (no proprietary blends). Third-party COAs, per-lot heavy-metal/microbial data, and specific standardization percentages are not publicly disclosed at the product level, which is a real transparency gap despite the honest single-ingredient formatting.
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
- 40 / 100
- Tier
- Rejected
- Category
- Supplements
- Subcategory
- joint bone connective
- Last scored
- Third-party certifications
- None on record at time of scoring
- Vendor
- Garden Organics
- Product type
- Vitamins & Supplements
- Tags
- Garden Organics, 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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