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UC-II (Undenatured Type II Collagen)
A low-dose (40mg) undenatured type II collagen that works by oral tolerance — modulating the immune response to joint cartilage. Several (mostly industry-funded) RCTs show modest improvement in knee osteoarthritis pain and joint flexibility, outperforming glucosamine+chondroitin in head-to-head trials.
What the evidence says
Most UC-II studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2009–2026 with a typical study size of 106 participants.
Based on 15 studies · 1 meta-analysis · 9 RCTs · 2,933 total participants
Confidence
High confidenceBy outcome
Moderate 5 reflects several RCTs showing modest knee-osteoarthritis pain and flexibility gains that outperformed glucosamine+chondroitin, but the trials are small, mostly industry-funded, and no independent meta-analysis exists.
13 rigorous studies
11 randomized trials · 2 meta-analyses · 2 systematic reviews
Our evidence rating for UC-II is accountable to this entire body of rigorous research indexed in PubMed — not a hand-picked subset.
PubMed · as of Jul 2026
31 trials ongoing or recruiting · 20 completed on ClinicalTrials.gov
8 of the completed trials have posted results
Registered trials show research momentum for UC-II, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Sep 2026
UC-II is a patented form of undenatured (native) type II collagen derived from chicken sternum cartilage, taken at a low 40mg daily dose.
Unlike collagen peptides (which are a protein/amino-acid source dosed in grams), UC-II works through 'oral tolerance': small amounts of intact type II collagen interact with gut-associated immune tissue to down-regulate the T-cell-driven immune attack on joint cartilage, reducing joint inflammation and pain.
A handful of randomized trials — several from the manufacturer — show modest improvements in knee-osteoarthritis WOMAC/pain scores and in knee flexibility/function in active healthy people, and two head-to-head trials found it outperformed glucosamine+chondroitin.
The evidence is moderate: trials are mostly small and industry-funded, and a large independent meta-analysis is lacking.
Low-dose intact type II collagen interacts with gut-associated lymphoid tissue (Peyer's patches) to induce immune tolerance, reducing the T-cell attack on joint cartilage.
By dampening the autoimmune/inflammatory response to joint collagen, UC-II helps preserve cartilage and reduce joint degradation.
Lower inflammatory cytokine activity in the joint as a downstream effect of immune tolerance.
How UC-II works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Not studied — avoid unless advised.
Mechanism modulates immune tolerance; discuss with a clinician.
Avoid — UC-II is derived from chicken sternum cartilage.
No significant documented drug interactions at the 40mg dose. This possible interaction has not been individually evaluated for this supplement; its likelihood and severity are unknown. If you take an anticoagulant or antiplatelet medicine, ask a pharmacist or prescriber before using this product. Do not stop or change prescribed medicines based on this notice.
Tip: Take with food; reduce if needed
Tip: Avoid if allergic to chicken
UC-II has an evidence score of 5/10 — moderate evidence based on 12 indexed studies. A low-dose (40mg) undenatured type II collagen that works by oral tolerance — modulating the immune response to joint cartilage. Several (mostly industry-funded) RCTs show modest improvement in knee osteoarthritis pain and joint flexibility, outperforming glucosamine+chondroitin in head-to-head trials. Representative study: PMID 26822714.
The commonly studied dose of UC-II is 40mg UC-II daily (providing ~10mg undenatured type II collagen). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
Timing is flexible for UC-II — consistent daily use matters more than the time of day. Trials dose 40mg once daily; often taken at bedtime on an empty stomach in studies, but timing is not critical.
UC-II is generally well-tolerated and considered safe for most healthy adults at recommended doses. Reported side effects are uncommon and include mild GI upset, allergic reaction (poultry-derived). Use caution if any of these apply to you: Allergy to chicken/poultry (source material); Pregnancy/breastfeeding (not studied).
PEA
Likely helpsNaturally occurring fatty acid that supports pain relief and reduces inflammation through the endocannabinoid system.
Collagen
Likely helpsHydrolyzed peptides that rebuild skin elasticity, reduce joint pain, and strengthen bone density — results build over 8-12 weeks.
MSM
Mostly mechanism / observationalOrganic sulfur donor for connective tissue repair — reduces joint inflammation and supports post-exercise recovery and flexibility.
White Willow Bark
Likely helpsNatural source of salicin (aspirin precursor) with evidence for pain relief and inflammation — gentler on the stomach than aspirin.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 15 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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