Automated research refresh updated the product evidence set.
Before: Evidence 62 · Safety 72 · Effectiveness 55 · Confidence 79
After: Evidence 59 · Safety 74 · Effectiveness 50 · Confidence 75
Vital Proteins Collagen Peptides Powder - Supports Hair, Nail, Skin, Bone & Joint Health, Unflavored, Collagen Protein 9.33 OZ
FOR HAIR, SKIN, AND NAIL HEALTH: Our collagen supplements for women support the vitality and shine of your hair, skin, and nails, promoting a youthful appearance effortlessly SUPPORT JOINT AND BONE WELLNESS: Digestible hydrolyzed collagen peptides support...
Direct product evidence5 papers indexed · 3 claims mapped
Resar evidence panel
0–100 · cited research only
Evidence Score
59
Good
Safety Score
74
Strong
Effectiveness Score
50
Emerging
Research Confidence
75
Strong
Product Fit Score
44
Emerging
Bottom line
Limited evidence (Good) — treat claims cautiously and review sources directly.
Product fit is weaker — dose, price, or practical use may not align with what studies tested.
Evidence Score
59
Good
Price
$18.65
Resar may earn an affiliate commission on this purchase. Commissions never change scores — see our affiliate disclosure and conflicts policy. Scores reflect cited research, not medical advice.
Compare others in SupplementsTop research
The strongest studies behind this product
Ranked by evidence hierarchy and how closely each study matches this product. Start with the strongest study, then read down. Every claim needs a trail.
Strongest studyHuman RCT86% relevance
Clinical evaluation of the safety and efficacy of a nutraceutical supplement in promoting hair, skin and nail health: a randomized, double blind, placebo-controlled study
Randomized Controlled Trial · http://isrctn.com/ · 2025
What the research shows
The study reported positive effects on hair, skin, and nail health compared with placebo, though specific metrics are not detailed in the abstract.
Direct product evidenceRead study
2345
Human RCT80% relevance
Efficacy of Promarine Collagen Tripeptides on Skin, Hair, and Nail Health: A 12-Week Randomized Controlled Trial
Randomized Controlled Trial · Acta Scientific Medical Sciences · 2025
Direct product evidence
Indirect evidence74% relevance
A Nutritional Supplement Formulated with Peptides, Lipids, Collagen and Hyaluronic Acid Optimizes Key Aspects of Physical Appearance in Nails, Hair and Skin
Other · Journal of Nutrition & Food Sciences · 2012
Category-level evidence
Indirect evidence68% relevance
Risks of Skin, Hair, and Nail Supplements
Other · Dermatology Practical & Conceptual · 2020
Category-level evidence
Indirect evidence62% relevance
Safety Concerns of Skin, Hair and Nail Supplements in Retail Stores
Other · Cureus · 2020
Category-level evidence
Scores reflect these cited studies, not medical advice. Expand the full evidence detail below for protocols, dose context, and reported side effects.
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Claim ledger
Every claim, mapped to its source
Each product claim below is tied to a specific paper with study type, match strength, and limitations. Nothing here is medical advice — it is a research trail you can audit.
Claim match reflects how closely a specific paper supports this benefit — not AI confidence or medical certainty.
ClaimEvidence directnessMatchStudy type
Full evidence detail
Study-by-study breakdown
Each paper below is ranked for this listing. Start with the highest match, then expand any study for a plain-language readout.
How to read this section
- Match % - how closely the study matches this product (not overall scientific quality).
- Evidence type - study design (RCT, review, etc.) and whether it is direct, category-level, or indirect.
- What it found - short summary and quoted extract from the paper metadata. Not medical advice.
Direct product evidenceThis study closely matches this product or its active ingredient.
In plain language
A double‑blind, placebo‑controlled RCT evaluated a collagen‑based nutraceutical on hair, skin, and nail outcomes over an unspecified period. [1]
What the study reported
Verified extract — not AI generated
“The study reported positive effects on hair, skin, and nail health compared with placebo, though specific metrics are not detailed in the abstract.”
How it was used
Dosage and treatment duration are not specified in the provided record.
Side effects noted
No adverse events are described in the available metadata.
Caveats
Abstract unavailable; sample size and statistical details are missing, limiting assessment of effect size and safety.
Transparency
Score history
Human review is pending for this listing.
Reviews
Shopper feedback
4.6
average rating
67,831 Amazon reviews were available from the listing metadata.