Combined collagen supplement did not outperform placebo for knee osteoarthritis
Pain and function improved in both trial groups, without a statistically significant advantage for the tested collagen combination.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The tested collagen combination did not demonstrate better pain relief, knee function, rescue medication use or patient satisfaction than placebo during the study. Both groups improved over time, so those improvements alone cannot establish a supplement benefit. The nonsignificant differences also do not prove the treatments are equivalent or rule out smaller effects.
The abstract gives no between-group effect estimates or confidence intervals, limiting assessment of what benefit remains plausible. The follow-up does not resolve longer-term effects, and the findings concern this particular collagen combination.
What researchers found
Pain intensity
Combined collagen versus placebo over 12 weeks, measured using the Verbal Numerical Rating Scale.
Improvement alone does not identify the cause
Pain and knee-function scores improved within both groups. The key treatment question was whether the collagen group improved more than the placebo group. The abstract reports no significant advantage on either outcome, despite those changes over time.
Other outcomes followed the same pattern
Use of rescue medication and patient satisfaction also showed no significant differences between groups. Neither group reported adverse effects, but that observation from this trial does not establish the safety of every collagen product or longer use.
The original publication
Efficacy of combined undenatured type II collagen and hydrolysed collagen supplementation in knee osteoarthritis: a randomised controlled trial.
Yuenyongviwat V, Anusitviwat C, Tuntarattanapong P et al.
Sci Rep · 2025
- PubMed ID
- 40897777
- Record checked
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