Automated research refresh updated the product evidence set.
Before: Evidence 73 · Safety 80 · Effectiveness 62 · Confidence 93
After: Evidence 75 · Safety 73 · Effectiveness 62 · Confidence 90
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 · 4 claims mapped
Resar evidence panel
0–100 · cited research only
Evidence Score
75
Strong
Safety Score
73
Strong
Effectiveness Score
62
Good
Research Confidence
90
Excellent
Product Fit Score
53
Emerging
Bottom line
Strong evidence (Strong) for supplements — worth a closer look if this fits your goals.
Product fit is weaker — dose, price, or practical use may not align with what studies tested.
Evidence Score
75
Strong
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 studyHigh-quality synthesis95% relevance
Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis
Meta Analysis · International journal of dermatology · 2021
What the research shows
Modest improvements in skin hydration and elasticity were observed.
Direct product evidenceRead study
2345
High-quality synthesis92% relevance
Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis
Meta Analysis · Nutrients · 2023
Direct product evidence
Human RCT88% relevance
Efficacy and tolerability of an oral supplement containing amino acids, iron, selenium, and marine hydrolyzed collagen in subjects with hair loss (androgenetic alopecia, AGA or FAGA or telogen effluvium). A prospective, randomized, 3-month, controlled, assessor-blinded study
Randomized Controlled Trial · Skin research and technology : official journal of International Society for Bioengineering and the Skin (ISBS) [and] International Society for Digital Imaging of Skin (ISDIS) [and] International Society for Skin Imaging (ISSI) · 2023
Direct product evidence
High-quality synthesis85% relevance
The Effects of Type I Collagen Hydrolysate Supplementation on Bones, Muscles, and Joints: A Systematic Review
Systematic Review · Orthopedic reviews · 2025
Direct product evidence
High-quality synthesis80% relevance
The effects of collagen peptide supplementation on body composition, collagen synthesis, and recovery from joint injury and exercise: a systematic review
Systematic Review · Amino Acids · 2021
Direct product 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
The meta‑analysis of randomized controlled trials (RCTs) found that oral hydrolyzed collagen supplementation modestly improved skin hydration and elasticity compared with placebo. Most studies used daily doses of 2.5–10 g for 8–12 weeks. Reported adverse events were mild and comparable to control groups. [1]
What the study reported
Verified extract — not AI generated
“Modest improvements in skin hydration and elasticity were observed.”
How it was used
2.5–10 g per day, typically administered for 8–12 weeks.
Side effects noted
Mild gastrointestinal discomfort in a small number of participants; otherwise no serious adverse effects reported.
Caveats
Heterogeneity among study protocols and limited long‑term follow‑up.
Transparency
Score history
Human review is pending for this listing.
Automated research refresh updated the product evidence set.
Before: Evidence 49 · Safety 74 · Effectiveness 50 · Confidence 70
After: Evidence 73 · Safety 80 · Effectiveness 62 · Confidence 93
Automated research refresh updated the product evidence set.
Before: Evidence 49 · Safety 74 · Effectiveness 50 · Confidence 70
After: Evidence 49 · Safety 74 · Effectiveness 50 · Confidence 70
Automated research refresh updated the product evidence set.
Before: Evidence 59 · Safety 74 · Effectiveness 50 · Confidence 75
After: Evidence 49 · Safety 74 · Effectiveness 50 · Confidence 70
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
Reviews
Shopper feedback
4.6
average rating
67,831 Amazon reviews were available from the listing metadata.