Horsetail extract and silica,
does it really help with Reduced hair loss and stronger hair and nails?
research showsThe verdict is unknown because no controlled standalone human trial was identified showing that horsetail extract reduces hair loss or strengthens hair or nails. A 50-person trial of purified choline-stabilized orthosilicic acid at 10 mg silicon per day found a subjective hair and nail brittleness signal, but it does not establish efficacy for unstandardized horsetail herbs or for treating hair loss.
ads claimThe mechanism that silicon may participate in collagen or keratin-related tissue is converted directly into a hair-growth claim, while purified orthosilicic acid, bamboo-derived silica, and horsetail powder are grouped as equivalent products.
Useful facts when choosing a product
- In Korea, horsetail is more often found in imported herbal capsules, teas, and silica combinations than as an authorized standalone functional product.
- There is no validated horsetail dose for hair-loss efficacy. The purified choline-stabilized orthosilicic acid trial used 10 mg silicon per day and is a different formulation.
- Equisetum species, extraction, silicon content, and removal of thiaminase can vary among products.
- Prolonged or high-dose horsetail use warrants separate caution for thiamine depletion, diuresis and electrolyte changes, drug interactions, and species substitution.
What the research actually shows
The 2005 Barel trial did not test horsetail. It assigned 50 women with photodamaged skin to purified choline-stabilized orthosilicic acid or placebo for 20 weeks. Subjective hair and nail brittleness showed signals, but hair density and growth were not measured. An 87-person nail-lacquer trial used a topical combination of hydroxypropyl chitosan, horsetail, and methylsulfonylmethane for psoriatic nails, so it cannot establish standalone oral horsetail efficacy for hair or nails. Horsetail and choline-stabilized orthosilicic acid are not the same ingredient or formulation.
Why this is classified as ?
The grade is unknown with a null score because standalone horsetail human efficacy literature is absent. One small purified-silicon brittleness trial is a separate C subclaim and was not transferred to horsetail or hair-loss treatment.
Counterpoint. An independent placebo-controlled trial of standardized horsetail measuring objective hair counts, shaft diameter, and nail breakage is needed.
Rejudgment record. Reassessment (cross-check reflected) — No standalone human horsetail efficacy trial; prohibited attribution from combination products and purified choline-stabilized orthosilicic acid across formulations
Cross-check — Codex and Claude
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| Barel et al. (2005) | Randomized double-blind placebo-controlled trial, 20 weeks | 50 | Included investigators linked to Bio Minerals | Skin measures and hair and nail brittleness VAS | Selected signals for purified orthosilicic acid; not standalone horsetail or alopecia efficacy | Excluded from cross-formulation attribution |
| Cantoresi et al. (2014) | Randomized double-blind placebo-controlled topical trial, 24 weeks | 87 | Fully funded by Polichem SA | Psoriatic-nail severity and clinical cure | A combination lacquer containing hydroxypropyl chitosan, horsetail, and methylsulfonylmethane was positive, but horsetail contribution cannot be isolated | Indirect, combination, topical, unrelated indication |
Receipt — 2 References
All 2 cited sources were verified for existence at the original page (as of 2026-07-16).
Reviewed and approved: Chamgap Editorial Team · Approval date: 2026-07-16 · Corrections: none
Cite this verdict
[Chamgap] Horsetail extract and silica x reduced hair loss and stronger hair and nails — Evidence Grade ?. 2 cited sources checked. Source: https://chamgap.com/en/verdicts/skin-hair/horsetail-extract-silica-hair-loss-hair-nails/ · CC BY 4.0CC BY 4.0 — free to use with attribution; do not distort grades, numbers, or verdict meaning.
What this document does and does not do
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