What is Type 2 Collagen? The Foundation of Joint Cartilage
Collagen is the main protein that comprises connective tissue (skin, bones, tendons, ligaments, cartilage). There are 28 specific types of collagen that have been identified, each differing in structure and function. Type 1 collagen is found in our skin, bones, blood vessels, tendons, and ligaments. Type 2 collagen is found in cartilage.
Cartilage is a tough, flexible connective tissue found throughout our bodies. Externally, cartilage makes up the structure of our ears. Internally, cartilage provides cushioning and shock absorption between bony surfaces in joints. Dietary supplements with Type 2 collagen are thought to specifically reduce joint pain.
Forms of Type 2 Collagen Supplements: Undenatured vs. Hydrolyzed
Undenatured (Native) Type 2 Collagen: Mechanism of Action and Dosage
Some collagen supplements are undenatured. What does that mean? Proteins, such as collagen, naturally adopt a variety of stereotypical structures, including helices, beta sheets, and Greek keys. These structures give proteins their biological activity. Cooking and digestion unwind, or denature these shapes. So undenatured (aka native) supplements simply retain the natural structure of collagen. That preserves their biological activity.
The native collagen structure in supplements is thought to present an advantage for joint health. Ingesting undenatured proteins induces a gut-mediated immune response, termed oral tolerance. In this response, as undenatured collagen is digested, your immune cells release anti-inflammatory cytokines and block the release of pro-inflammatory cytokines, producing a net anti-inflammatory effect that should reduce pain and improve joint health. In patients with knee osteoarthritis, ingesting 40mg/day of undenatured type 2 collagen has led to reduced pain and improved range of motion within 12 weeks.
Hydrolyzed Type 2 Collagen: Breakdown and Absorption
Hydrolyzed type 2 collagen supplements are processed into their constituent amino acids. In theory, hydrolyzed supplements could provide building blocks with which your body can synthesize new cartilage. The recommended dosages for hydrolyzed supplements are much higher (10g per day), and there are no studies supporting the efficacy of hydrolyzed collagen in reducing joint pain. Thus, the value of hydrolyzed collagen supplements remains theoretical.
Scientific Efficacy of Type 2 Collagen for Joint Health
Research on Osteoarthritis (OA) and Joint Pain
As mentioned above, there are no clinical trials showing that hydrolyzed collagen supplements improve joint health. In contrast, undenatured type II collagen (UC2) has a fair amount of research backing its efficacy.
Some examples are presented here:
Some examples are presented here:
Considerations for Choosing a Type 2 Collagen Supplement
Currently available data support the potential of undenatured type 2 collagen supplements to reduce joint pain. The daily dosage of UC2 ingested in most studies was 40mg/day. Bear in mind that while UC2 does have some decent supporting evidence that it can alleviate joint pain, it is best viewed as an adjunct treatment.
If you are experiencing joint pain, the best course of action is to consult with your medical provider. Prescribed exercise therapy, medication, and potentially UC2 supplementation can be a powerful combination to alleviate pain and improve your quality of life.
FAQs
What is type 2 collagen, and how is it different from other types of collagen?
Type 2 collagen is the primary collagen found in cartilage, the connective tissue that cushions joints. In contrast, type 1 collagen is most abundant in skin, bones, tendons, and ligaments, while type 3 collagen is commonly found in muscles, blood vessels, and organs. Because type 2 collagen is concentrated in cartilage, supplements containing this form are often marketed to support joint health and mobility.
Does type 2 collagen help with joint pain?
Some research suggests that type 2 collagen supplementation may help reduce joint discomfort and improve mobility, particularly in individuals with osteoarthritis or exercise-related joint stress. However, results vary among studies, and collagen supplements should not be considered a cure for joint conditions. More high-quality research is needed to fully understand their long-term effectiveness.
How long does it take for type 2 collagen supplements to work?
Collagen supplements typically do not produce immediate results. Studies evaluating type 2 collagen often measure outcomes after several weeks or months of consistent use. Individual results may depend on factors such as age, overall health, activity level, and the severity of joint symptoms.
Are type 2 collagen supplements safe?
Type 2 collagen supplements are generally considered safe for most healthy adults when used as directed. However, they are often derived from animal sources such as chicken cartilage, which may not be suitable for individuals with certain dietary preferences or allergies. Anyone who is pregnant, breastfeeding, taking medications, or managing a chronic health condition should consult a healthcare provider before starting a new supplement.
Can I get type 2 collagen from food instead of supplements?
Foods containing cartilage and connective tissue, such as homemade bone broth or slow-cooked meats, naturally provide collagen and related compounds. However, the amount and form of collagen obtained from food can vary significantly. Supplements offer standardized doses, which is why they are commonly used in research studies evaluating joint health outcomes.
References
1Gupta, A., & Maffulli, N. (2025). Undenatured type II collagen for knee osteoarthritis. *Annals of Medicine*. https://doi.org/10.1080/07853890.2025.2493306
2Simental-Mendía, M., Ortega-Mata, D., Acosta-Olivo, C. A., Simental-Mendía, L. E., Peña-Martínez, V. M., & Vilchez-Cavazos, F. (2024). Effect of collagen supplementation on knee osteoarthritis: an updated systematic review and meta-analysis of randomised controlled trials. https://doi.org/10.55563/clinexprheumatol/kflfr5
3Santana, É. T. N., da Cunha Machado, S., Brandão Lima, V. N., DeSantana Filho, V. J., dos Santos Maciel, L. Y., de Farias Neto, J. P., Coutinho, H. D. M., Martins, N., Monteiro da Silva Júnior, W., & Quintans Júnior, L. J. (2022). Comparison between exercise therapy and non-hydrolyzed collagen (NHC-type II) in functionality and quality of life in women with knee osteoarthritis. Wiener klinische Wochenschrift. https://doi.org/10.1007/s00508-022-02037-8
4Crowley, D. C., Lau, F. C., Sharma, P., Evans, M., Guthrie, N., Bagchi, M., Bagchi, D., Dey, D. K., & Raychaudhuri, S. P. (2009). Safety and efficacy of undenatured type II collagen in the treatment of osteoarthritis of the knee: a clinical trial. International Journal of Medical Sciences. https://doi.org/10.7150/ijms.6.312
5SADIGURSKY, D., MAGNAVITA, V. F. S., SÁ, C. K. C. D., MONTEIRO, H. D. S., BRAGHIROLI, O. F. M., & MATOS, M. A. A. (2022). UNDENATURED COLLAGEN TYPE II FOR THE TREATMENT OF OSTEOARTHRITIS OF THE KNEE. Acta Ortopédica Brasileira. https://doi.org/10.1590/1413-785220223002240572
6Lugo, J. P., Saiyed, Z. M., Lau, F. C., Molina, J. P. L., Pakdaman, M. N., Shamie, A. N., & Udani, J. K. (2013). Undenatured type II collagen (UC-II®) for joint support: a randomized, double-blind, placebo-controlled study in healthy volunteers. https://doi.org/10.1186/1550-2783-10-48
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