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Types of Collagen Type II: Forms & Bioavailability

Evidence:Moderate
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Forms Comparison

FormBioavailabilityBest For
Hydrolyzed Type II CollagenHighStructural support — broken into small peptides for absorption; works as building blocks for cartilage
Undenatured Type II Collagen (UC-II)N/A (immune mechanism)Oral tolerance — different mechanism; see UC-II entry for details
Chicken Sternum CollagenModerate-HighNatural source of type II collagen — most common extraction source

Hydrolyzed Type II Collagen

Bioavailability: High. Best for: Structural support — broken into small peptides for absorption; works as building blocks for cartilage.

Undenatured Type II Collagen (UC-II)

Bioavailability: N/A (immune mechanism). Best for: Oral tolerance — different mechanism; see UC-II entry for details.

Chicken Sternum Collagen

Bioavailability: Moderate-High. Best for: Natural source of type II collagen — most common extraction source.

Full Collagen Type II Guide

References

  1. RCTBruyere O, Zegels B, Leonori L, et al. (2012). Effect of collagen hydrolysate in articular pain: a 6-month randomized, double-blind, placebo controlled study. Complementary Therapies in Medicine. DOI PubMed
  2. RCTFladerer-Grollitsch JP, Klein T, Kompek A, Steiner N, et al. (2025). Effects of cartilage-supporting nutritional supplementation on knee osteoarthritis symptoms and quality of life in a 12-week randomized double-blind placebo-controlled pilot study.. Scientific reports. DOI PubMed
  3. RCTAlekseeva LI, Kashevarova NG, Taskina EA, Strebkova EA, et al. (2024). [Efficacy and safety of undenatured type II collagen in patients with knee osteoarthritis: a multicenter, prospective, double-blind, placebo-controlled, randomized trial].. Terapevticheskii arkhiv. DOI PubMed
  4. RCTLaky B, Huemer D, Eigenschink M, Sagl B, et al. (2024). A Dietary Supplement in the Management of Patients with Lumbar Osteochondrosis: A Randomized, Double-Blinded, Placebo-Controlled Study.. Nutrients. DOI PubMed
  5. ReviewKumar P, Bansal P, Rajnish RK, Sharma S, et al. (2023). Efficacy of undenatured collagen in knee osteoarthritis: review of the literature with limited meta-analysis.. American journal of translational research. PubMed
  6. Karlapudi V, Sunkara KB, Konda PR, Sarma KV, et al. (2023). Efficacy and Safety of Aflapin®, a Novel Boswellia Serrata Extract, in the Treatment of Osteoarthritis of the Knee: A Short-Term 30-Day Randomized, Double-Blind, Placebo-Controlled Clinical Study.. Journal of the American Nutrition Association. DOI PubMed
  7. Martins JMS, Dos Santos Neto LD, Sgavioli S, Araújo ICS, et al. (2023). Effect of glycosaminoglycans on the structure and composition of articular cartilage and bone of broilers.. Poultry science. DOI PubMed