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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, and one placebo-controlled trial found it significantly better than glucosamine+chondroitin.
What the evidence says
UC-II doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality meta-analyses and randomised trials published 2009–2026 with a typical study size of 105 participants.
Based on 15 studies · 1 meta-analysis · 9 RCTs · 160 total participants
Confidence
Moderate confidenceBy outcome
Moderate 5 reflects several RCTs showing modest knee-osteoarthritis pain and flexibility gains, one of which found it significantly better than glucosamine+chondroitin, but the trials are small, mostly industry-funded, and no independent meta-analysis exists.
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research momentum for UC-II, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed.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 Oct 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 in a 191-person trial it reduced WOMAC scores significantly more than glucosamine+chondroitin (p = 0.04), while a second comparison reported larger reductions with no test between the groups.
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 15 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, and one placebo-controlled trial found it significantly better than glucosamine+chondroitin. 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, so check the right dose for you with a healthcare provider.
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 include allergic reaction (poultry-derived), mild GI upset. How often they occur is not established for all of them. Use caution if any of these apply to you: Allergy to chicken/poultry (source material); Pregnancy/breastfeeding (not studied).
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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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