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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 medium-quality randomised trials published 2009–2025 with a typical study size of 96 participants.
Based on 7 studies · 4 RCTs · 499 total participants
Confidence
ModerateBy outcome
UC-II has an evidence score of 5/10 — moderate evidence based on 7 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.
See full supplement plans that include UC-II.
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Last reviewed June 2026 · evidence from 7 studies · how we score
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.
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.
40mg UC-II daily (providing ~10mg undenatured type II collagen)
Can be taken without food
| Form | Type |
|---|---|
| 💊Undenatured type II collagen (UC-II, 40mg) | Recommended |
| 💊Capsule | Alternative |
Must be UNDENATURED — hydrolyzed collagen peptides are a different product with a different mechanism.
Minimum: 4 weeks
Optimal: 24 weeks
Cycling: Not required
Note: 40mg once daily; timing not critical.
Dose-response data unavailable. The current published research for UC-II does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
Eases knee osteoarthritis pain and stiffness (WOMAC/VAS).
Improves knee range of motion and function, including in active healthy people.
Works at just 40mg/day — far less than gram-dose collagen peptides.
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.
Tip: Take with food; reduce if needed
Tip: Avoid if allergic to chicken
Both ease joint pain via different routes — UC-II via immune tolerance, boswellia via 5-LOX anti-inflammatory action.
Complementary joint-pain support.
Curcumin's anti-inflammatory action complements UC-II's immune-tolerance mechanism for joint comfort.
Broader joint anti-inflammatory support.
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. The most commonly reported side effects are 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).
Hydrolyzed peptides that rebuild skin elasticity, reduce joint pain, and strengthen bone density — results build over 8-12 weeks.
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