Taking 5 grams of collagen peptides daily for 12 weeks significantly reduced activity-related knee pain in young athletes compared to placebo, confirmed by both self-reports and physician assessments.
40% greater improvementThe collagen peptide group showed a 19.5-point improvement in activity-related pain versus 13.9 points for placebo — about 40% more pain reduction over 12 weeks
What the researchers found
Young athletes with functional knee pain who took 5 grams of bioactive collagen peptides daily for 12 weeks experienced significantly greater reduction in activity-related knee pain compared to placebo. The collagen group improved by 19.5 points on the VAS pain scale versus 13.9 points for placebo (p=0.046). Independent physician assessments confirmed the result (16.7 vs 12.2 points, p=0.021). Participants taking collagen peptides also significantly reduced their use of additional treatments like taping, physical therapy, or anti-inflammatory drugs.
Why it matters
Knee pain is one of the most common complaints among athletes, and conventional treatments often involve NSAIDs (which carry side effects) or rest (which interrupts training). This randomized controlled trial provides evidence that a simple oral collagen peptide supplement can meaningfully reduce activity-related knee pain in young, active people — offering a low-risk alternative or complement to standard treatments.
The numbers in context
n=139 · 5g collagen peptides/day · 12 weeks · VAS improvement: 19.5 vs 13.9 (p=0.046) · Physician VAS: 16.7 vs 12.2 (p=0.021) · Reduced use of additional therapies
How the study worked
Double-blind, randomized, placebo-controlled trial. 139 young athletic adults with functional knee pain were assigned to receive either 5 grams of bioactive collagen peptides or placebo daily for 12 weeks. Pain during activity and at rest was measured using a visual analogue scale (VAS) by both participants and physicians. Secondary outcomes included knee range of motion and use of additional treatments.
Who was studied
Young adult athletes (male and female) with functional knee joint pain during activity
What this study cannot tell us
The difference between groups, while statistically significant, was relatively modest (about 5.6 VAS points for self-reported, 4.5 for physician-assessed). Resting pain did not reach statistical significance. Range of motion showed no improvement, though this may reflect that participants had normal baseline mobility. The study was funded by GELITA AG, a collagen manufacturer, and one author (Oesser) is affiliated with the collagen research institute.
How to read the evidence
This is a double-blind, randomized, placebo-controlled trial — the gold standard for supplement research. The sample size of 139 is reasonable, and both subjective and physician-assessed outcomes were statistically significant. Industry funding and modest effect sizes are noted limitations.
When this study was published
Published in 2017, this remains one of the better-designed RCTs on collagen peptides for joint pain in athletes. Its findings have been cited in numerous subsequent reviews and meta-analyses.
The bigger picture
Collagen peptide supplements have become hugely popular in the sports and wellness world, but the evidence base has been building slowly. This RCT adds to a growing body of trials showing that specific collagen peptides may support joint health in active people. The finding that participants reduced their use of other therapies is particularly noteworthy, as it suggests real-world functional benefit beyond just subjective pain scores.
Questions still open
- Would longer supplementation periods produce greater pain reduction, or does the benefit plateau at 12 weeks?
- What specific mechanism allows ingested collagen peptides to improve joint comfort — is it structural repair or anti-inflammatory effects?
- Would collagen peptides show similar benefits in older adults with osteoarthritis, where joint degeneration is more advanced?
Common questions
How much collagen peptide should I take for knee pain?
How long does it take for collagen peptides to help joint pain?
Read the original research
Improvement of activity-related knee joint discomfort following supplementation of specific collagen peptides.
Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme, 42(6), 588-595
Citation
Zdzieblik, Denise; Oesser, Steffen; Gollhofer, Albert; König, Daniel. (2017). Improvement of activity-related knee joint discomfort following supplementation of specific collagen peptides.. Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme, 42(6), 588-595. https://doi.org/10.1139/apnm-2016-0390