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Mechanism of ActionKey BenefitsDosage & FormsIn the Singular FormulaSafety & PrecautionsScientific StudiesFrequently Asked Questions
Collagen Type II

Collagen Type II

UC-II · Collagène natif de type II · Undenatured Type II Collagen · Native Type II Collagen

PeptidesTissue structure

Undenatured type II collagen is a cartilage protein used at a very low dose. Its best-documented effect concerns joint comfort: randomized trials lasting three to six months record better knee comfort and function scores. In healthy adults who feel discomfort during activity, one trial also measures a gain in flexion range. An independent meta-analysis of 69 trials retains it among the only two supplements, out of twenty compared, that keep a clinically important effect at medium term. The level of evidence remains moderate. Cartilage is among the slowest tissues to renew, and joint wear sets in from the thirties onward. Preserving joint comfort and mobility over the decades then becomes a tangible matter of lasting vitality.

Last updated: August 7, 2026

Mechanism of Action

Undenatured type II collagen works on a different principle from hydrolyzed collagen. It does not serve as raw material. Its native form allows it to be recognized by the intestinal immune system, which initiates a process called oral tolerance.

The mechanism unfolds in three stages. The collagen reaches the small intestine with its three-dimensional structure intact. It comes into contact with Peyer's patches, those clusters of immune cells embedded in the intestinal wall. These cells identify the collagen's recognition patterns and initiate oral tolerance.

What follows is described in animals: regulatory immune cells migrate toward the joint areas and modulate the local response there. In humans this chain has not been measured, and the authors of the largest trial present it as a hypothesis still to be elucidated.

This specificity explains the very low doses used. Hydrolyzed collagen requires several grams per day to supply building amino acids. A few milligrams of undenatured collagen are enough to carry the immune signal.

Key Benefits

  • Moderate

    Joint comfort measured over six months: a randomized placebo-controlled trial records better knee comfort and function scores. 40 mg daily for 180 days, in 191 adults aged 40 to 75 whose radiographs show knee wear.

  • Moderate

    More range in knee flexion: a randomized placebo-controlled trial measures a 3.2-degree gain by goniometer, against 0.2 on placebo. 40 mg daily for 24 weeks, in 96 healthy adults aged 20 to 55 with activity-related knee discomfort.

  • Moderate

    Singled out by an independent review: a meta-analysis of 69 trials compares 20 supplements for joint discomfort. Only two retain an effect judged clinically important at medium term, and undenatured type II collagen is one of them.

Dosage & Forms

Two main families of collagen coexist on the market. Hydrolyzed collagen is obtained through enzymatic or chemical degradation. It supplies amino acids and short peptides but loses its three-dimensional structure, and its studied doses are counted in grams.

Undenatured type II collagen keeps its conformation intact, and trials use it at 40 mg of material per day. That material is chicken sternum cartilage, standardized on two assays: about 25 % total collagen, and at least 3 % type II collagen that has remained undenatured, measured by immunoassay. Forty milligrams therefore deliver on the order of 1.2 mg of the fraction that carries the effect.

This figure calls for a clarification, because the literature gives two. Until 2014 the assay used a longer extraction and reported about 10 mg for the same material. In 2019 the maker of the studied material published a re-assay of its clinical lots by both methods: the material had not changed, the measurement had. The trials cited here were run on lots assaying 1.2 to 2.3 mg by the current method.

In the Singular Formula

Inclusion rationale

Two collagens coexist in the formula, and they do not do the same work. Undenatured type II is here for joint comfort, on the strength of randomized trials run at 40 mg per day over three to six months.

The received idea to set aside is interchangeability. Hydrolyzed collagen is cut into short peptides and serves as raw material: it is used in grams. Undenatured type II keeps its three-dimensional structure intact, and that integrity is what counts. Recognized as such by the immune system of the small intestine, it engages a process of oral tolerance. Hence doses on a wholly different scale: 40 mg of material, about 1.2 mg of the fraction that has remained native.

This apparent weakness of dose is a property of the mechanism, not a formulation saving. Oral tolerance trials with collagen in humans place their optimum below the milligram, and higher doses do no better there.

In the formula, undenatured type II sits alongside glucosamine, which takes the structural route by supplying the precursors of cartilage glycosaminoglycans. Vitamin C completes the set: it contributes to normal collagen formation for the normal function of cartilage.

Selected form

Patented active

Nuvicol® II is 100% chicken sternum cartilage providing at least 3% non-denatured type II collagen, with no added excipient. The non-denatured form preserves collagen's native three-dimensional structure and specific epitopes, unlike a hydrolysed form. This natural cartilage matrix also contains chondroitin sulphate and hydroxyproline, structural components of hyaline cartilage. Type II collagen is the predominant protein in articular cartilage. Manufactured in the Netherlands.

Formula dosage

0 to 40 mg.

Dose expressed as active substance, excluding excipients and carriers of the raw material.

Synergies in the formula

Undenatured type II collagen fits into a network of complementarity with several bioactives in the formula. Glucosamine takes a different route: it supplies the direct precursors of glycosaminoglycans, the molecules that make up the cartilage matrix. Where type II collagen acts on the immune side, glucosamine supports the structural side. Available data document them separately, without establishing that their combination does better than either alone. Vitamin C contributes to normal collagen formation for the normal function of cartilage. It is the cofactor for the hydroxylation of proline and lysine, two steps in the body's own collagen production. Hyaluronic acid is not treated here as a joint lever: the evidence assessed in its dossier concerns the skin, and nothing establishes a synergy with type II collagen or glucosamine.

Safety & Precautions

Undenatured type II collagen shows a good tolerability profile at the studied doses. Clinical trials lasting 90 to 180 days report no adverse effects different from placebo, and the animal toxicology dossier is complete and negative. The window actually observed stops at 180 days.

The source is chicken cartilage. People sensitive to poultry proteins should set this bioactive aside. Cross-reactivity between poultry proteins and egg proteins is also described in some people, chicken serum albumin being its known carrier. The sites that produce this cartilage also handle egg. People allergic to egg should therefore set it aside as well.

Use is not advised during pregnancy and breastfeeding: trials excluded these situations, and no data exist. No study has assessed safety below the age of 18.

Non-steroidal anti-inflammatory drugs and cortisone slow the establishment of oral tolerance. People who take them regularly may discuss this with a healthcare professional before use.

Scientific Studies

AuthorsYearTypeJournal

Dietary supplements for treating osteoarthritis: a systematic review and meta-analysis

Independent meta-analysis of 69 trials across 20 supplements. Undenatured type II collagen is one of only two that keep an effect judged clinically important on joint discomfort at medium term. At short term the effect is significant but of unclear clinical importance, and no supplement keeps one at long term.

Efficacy and tolerability of an undenatured type II collagen supplement in modulating knee osteoarthritis symptoms: a multicenter randomized, double-blind, placebo-controlled study

A 180-day multicenter trial in 191 adults aged 40 to 75, with three arms: placebo, glucosamine plus chondroitin, and 40 mg per day of undenatured type II collagen. Knee comfort and function scores improved more than on placebo. The paper states that this dose delivered 1.2 mg of undenatured collagen. Trial funded by the maker of the tested material.

UC-II Undenatured Type II Collagen for Knee Joint Flexibility: A Multicenter, Randomized, Double-Blind, Placebo-Controlled Clinical Study

96 healthy adults aged 20 to 55, with knee discomfort on a single-leg step-down test, followed for 24 weeks. Flexion range gained 3.2 degrees against 0.2 on placebo. Extension range progressed within the supplemented group, with no significant difference between groups. Three authors are employees of the manufacturer.

Letter to the editor UC-II Undenatured type II collagen: update to analytical methods

A letter from the manufacturer re-assaying three clinical lots by the old and the new extraction method. The same lot assays 27 % by one and 3 % by the other. The material had not changed; only the sample preparation was shortened in 2014. This is the publication that reconciles the two figures, 10 mg and 1.2 mg, that the literature reports for one and the same 40 mg dose.

Efficacy and tolerability of native (undenatured) type II collagen supplementation for joint health in healthy volunteers: a randomized double-blind placebo-controlled study

74 healthy adults with activity-related knee discomfort, 40 mg per day for 180 days. Both groups improved significantly on the joint function score, and the trial did not separate the product from placebo on its primary endpoint. Between-group differences appeared on how early the improvement set in, and within subgroups. Authors are employees of the manufacturer.

Efficacy and safety of native type II collagen in modulating knee osteoarthritis symptoms: a randomised, double-blind, placebo-controlled trial

101 adults aged 40 to 65, three arms, 12 weeks. Native type II collagen and the glucosamine plus chondroitin combination both did better than placebo, and were level with each other on the overall joint score. This trial therefore does not reproduce the superiority over glucosamine plus chondroitin reported elsewhere. Collagen did better on quality of life.

Efficacy of undenatured collagen in knee osteoarthritis: review of the literature with limited meta-analysis

Systematic review with limited meta-analysis, eight randomized trials and 243 adults who received undenatured type II collagen. Comfort and function scores were better than on placebo, and walking tests improved. The authors themselves describe the literature as limited and call for larger trials.

Undenatured type II collagen (UC-II) for joint support: a randomized, double-blind, placebo-controlled study in healthy volunteers

55 healthy, physically active adults, 120 days. Knee extension improved relative to placebo. The post-exercise discomfort measures did not separate from placebo. The lot used was richer than the current specification: about 2.3 mg of undenatured collagen by the present assay method.

Safety and efficacy of undenatured type II collagen in the treatment of osteoarthritis of the knee: a clinical trial

52 adults aged 40 to 75, 90 days, a head-to-head comparison between 40 mg per day of undenatured type II collagen and the glucosamine plus chondroitin combination. Joint scores improved more on collagen. The trial has only these two arms, with no placebo group, which limits what can be attributed to it.

Frequently Asked Questions

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