Undenatured Type II Collagen
Also known as: UC-II, undenatured collagen type II
Randomised trials and a systematic review/meta-analysis report that undenatured type II collagen at 40 mg daily produced statistically significant improvements in WOMAC pain, stiffness and function in patients with knee osteoarthritis in several trials and improved knee range of motion in healthy subjects with activity‑related joint discomfort. A recent trial of a combined hydrolysed collagen plus UC‑II product found no benefit versus placebo over 12 weeks.
Last reviewed: 2026-10-14 · 5 indexed studies
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Overview
Undenatured type II collagen (commonly sold as UC-II) is a low‑dose oral collagen preparation derived from chicken sternum cartilage that has been studied for knee osteoarthritis and activity-related joint discomfort. Clinical trials have tested daily doses of 40 mg and report improvements in some measures of pain, function and knee range of motion versus placebo, though not all trials are positive.
Mechanism & Function
Mechanism of Action
The clinical reports in the provided abstracts do not establish a definitive mechanism; trial authors note efficacy but state that additional studies are needed to elucidate mechanisms. Proposed mechanisms are not detailed in these abstracts.
Physiological Role
Not established by the provided clinical abstracts; clinical studies focus on symptom outcomes (pain, function, range of motion) rather than direct measures of cartilage structure or systemic biomarkers.
Primary Pathways
Performance / Health Relevance
May reduce perceived joint pain and improve joint function and flexibility in people with knee osteoarthritis or activity‑related joint discomfort, based on the clinical outcomes reported in multiple trials and a meta-analysis. Results are not uniformly positive across all trials.
Evidence Review
Practical Use & Dosage
- Minimum Effective Dose
- 40 mg/day (as used in multiple RCTs)
- Optimal Range
- 40 mg/day (clinical trials reported benefits at this dose)
- Upper / Caution Level
- Not established
- Timing
- Daily dosing in trials; timing relative to meals not specified in abstracts
- Best Format
- Oral tablet/capsule containing undenatured type II collagen
- Bioavailability
- Not described in the provided abstracts
- Absorption Considerations
- Not described in the provided abstracts
Safety & Interactions
Side Effects
- •No differences in adverse events versus placebo reported in included trials
Contraindications
- Not established in provided abstracts
Drug Interactions
- •Not reported in provided abstracts
Who Should Avoid
- •Not specified in the provided abstracts; usual caution in pregnancy, breastfeeding or major illness not addressed here
Monitoring
Trials reported safety outcomes but did not identify specific monitoring requirements.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Undenatured Type II Collagen typically used or indicated?
Undenatured Type II Collagen is most commonly used for: Knee osteoarthritis symptom management, Activity-related joint discomfort, Maintaining joint flexibility. Not established by the provided clinical abstracts; clinical studies focus on symptom outcomes (pain, function, range of motion) rather than direct measures of cartilage structure or systemic biomarkers.
How does Undenatured Type II Collagen work?
The clinical reports in the provided abstracts do not establish a definitive mechanism; trial authors note efficacy but state that additional studies are needed to elucidate mechanisms. Proposed mechanisms are not detailed in these abstracts.
What is the recommended dose of Undenatured Type II Collagen?
The optimal range is 40 mg/day (clinical trials reported benefits at this dose). with a minimum effective dose of 40 mg/day (as used in multiple RCTs). Best taken: Daily dosing in trials; timing relative to meals not specified in abstracts. Upper / caution level: Not established.
What are the side effects of Undenatured Type II Collagen?
Reported side effects include: No differences in adverse events versus placebo reported in included trials. Monitoring: Trials reported safety outcomes but did not identify specific monitoring requirements.
Does Undenatured Type II Collagen interact with medications?
Known or theoretical interactions: Not reported in provided abstracts. Always check with a clinician before combining with prescription medication.
Who should avoid Undenatured Type II Collagen?
Undenatured Type II Collagen is generally not recommended for: Not specified in the provided abstracts; usual caution in pregnancy, breastfeeding or major illness not addressed here; and Not established in provided abstracts.
How strong is the evidence for Undenatured Type II Collagen?
Evidence level: Moderate (overall score 64/100), based on 5 indexed studies on SuppIndex.
Research & References (5)
Dietary supplements for treating osteoarthritis: a systematic review and meta-analysis.
Systematic review and meta-analysis of oral dietary supplements for osteoarthritis; assessed multiple supplements including undenatured type II collagen.
Efficacy and tolerability of an undenatured type II collagen supplement in modulating knee osteoarthritis symptoms: a multicenter randomized, double-blind, placebo-controlled study.
Multicentre randomized, double-blind, placebo-controlled study in knee osteoarthritis comparing UC‑II 40 mg/day, glucosamine+chondroitin, and placebo over 180 days.
UC-II Undenatured Type II Collagen for Knee Joint Flexibility: A Multicenter, Randomized, Double-Blind, Placebo-Controlled Clinical Study.
Randomized, double-blind, placebo-controlled study in healthy subjects with activity‑related joint discomfort assessing knee range of motion after 24 weeks of 40 mg/day undenatured collagen.
Safety and efficacy of undenatured type II collagen in the treatment of osteoarthritis of the knee: a clinical trial.
Clinical trial comparing undenatured type II collagen with glucosamine+chondroitin in knee osteoarthritis over 90 days.
Efficacy of combined undenatured type II collagen and hydrolysed collagen supplementation in knee osteoarthritis: a randomised controlled trial.
Randomized, double-blind, placebo-controlled trial evaluating combined undenatured type II collagen and hydrolysed collagen versus placebo in knee osteoarthritis over 12 weeks.
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Research Overview
Moderate EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/undenatured-type-ii-collagen
SuppIndex. (2026). Undenatured Type II Collagen: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/undenatured-type-ii-collagen
Based on 5 indexed studies · Evidence level: Moderate.
Goal Ratings
Stack Compatibility
One trial compared UC‑II with glucosamine plus chondroitin; combined products have been trialled but evidence is mixed.