Collagen trials found lower rodent body mass, with very uncertain evidence
A review pooled animal trials of collagen peptides during diets high in fat or calories. The findings do not establish benefits for human weight loss.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Rodents given collagen peptides had lower body mass than those given placebo, alongside changes in food intake and metabolic markers. However, the review rated certainty as very low for every outcome. The results describe animals under particular dietary conditions and do not establish that collagen produces weight loss in humans.
The review found moderate to high risk of bias. Abstract-only access limits examination of these weaknesses, and human effects remain largely unexplored.
What researchers found
Body mass in rodents
Body mass differed by -1.87 standard deviations with collagen versus placebo after at least 3 weeks. Negative means lower mass; standard deviations express the difference relative to weight variability, not grams, percentage loss or human benefit.
Reading the body-mass estimate
The review pooled controlled animal trials using a standardized mean difference. This statistic compares groups relative to variation in the measurements; it does not describe weight change for an individual animal.
What else was measured
Researchers also reported changes in food intake, blood lipids and hormone markers. These measurements extend the animal findings, but they do not demonstrate that collagen prevents obesity-related disease or benefits people.
The original publication
Regular collagen peptide administration exerts anti-obesity effects in high-caloric diet-fed rodents-a systematic review with meta-analysis of animal trials.
Bischof K, Moitzi AM, König D
Int J Obes (Lond) · 2026
- PubMed ID
- 41168365
- Record checked
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