Barclay TS, Tsourounis C, McCart GM. Glucosamine. Ann Pharmacother 1998;32:574-9. View abstract.

Barnett ML, Kremer JM, St.Clair W, et al. Treatment of rheumatoid arthritis with oral type II collagen. Arthritis Rheum 1998;41:290-7. View abstract.

Barnett ML, Combitchi D, Trentham DE. A pilot trial of oral type II collagen in the treatment of juvenile rheumatoid arthritis. Arthritis Rheum 1996;39:623-8. View abstract.

Kalden JR, Sieper J. Oral collagen in the treatment of rheumatoid arthritis [editorial]. Arthritis Rheum 1998;41:191-4.

Trentham DE. Oral tolerization as a treatment of rheumatoid arthritis. Rheum Dis Clin North Am 1998;24:525-36. View abstract.

Mullins RJ, Richards C, Walker T. Allergic reactions to oral, surgical and topical bovine collagen. Anaphylactic risk for surgeons. Aust N Z J Ophthalmol 1996;24:257-60. View abstract.

AutoImmune Inc. announces phase III trial results for Colloral. URL http://www.autoimmune.com/clinic/coll.html (Accessed 24 October 1999).

Xie Q, Shi R, Xu G, et al. Effects of AR7 Joint Complex on arthralgia for patients with osteoarthritis: results of a three-month study in Shanghai, China. Nutr J. 2008 Oct 27;7:31. View abstract.

McKown, K. M., Carbone, L. D., Kaplan, S. B., Aelion, J. A., Lohr, K. M., Cremer, M. A., Bustillo, J., Gonzalez, M., Kaeley, G., Steere, E. L., Somes, G. W., Myers, L. K., Seyer, J. M., Kang, A. H., and Postlethwaite, A. E. Lack of efficacy of oral bovine type II collagen added to existing therapy in rheumatoid arthritis. Arthritis Rheum 1999;42(6):1204-1208. View abstract.

Zhang, L. L., Wei, W., Xiao, F., Xu, J. H., Bao, C. D., Ni, L. Q., and Li, X. F. A randomized, double-blind, multicenter, controlled clinical trial of chicken type II collagen in patients with rheumatoid arthritis. Arthritis Rheum 7-15-2008;59(7):905-910. View abstract.

Trentham, D. E., Dynesius-Trentham, R. A., Orav, E. J., Combitchi, D., Lorenzo, C., Sewell, K. L., Hafler, D. A., and Weiner, H. L. Effects of oral administration of type II collagen on rheumatoid arthritis. Science 9-24-1993;261(5129):1727-1730. View abstract.

Hauselmann, H. J., Caravatti, M., Seifert, B., Wang, K., Bruckner, P., Stucki, G., and Michel, B. A. Can collagen type II sustain a methotrexate-induced therapeutic effect in patients with long-standing rheumatoid arthritis? A double-blind, randomized trial. Br J Rheumatol 1998;37(10):1110-1117. View abstract.

Crowley DC, Lau FC, Sharma P, Evans M, Guthrie N, Bagchi M, et al Safety and efficacy of undenatured type II collagen in the treatment of osteoarthritis of the knee: a clinical trial. Int J Med Sci. 2009 Oct 9;6(6):312-21. View abstract.

Lugo JP, Saiyed ZM, Lane NE. Efficacy and tolerability of an undenatured type II collagen supplement in modulating knee osteoarthritis symptoms: a multicenter randomized, double-blind, placebo-controlled study.Nutr J. 2016;15:14. doi: 10.1186/s12937-016-0130-8. View abstract.

Wei W, Zhang LL, Xu JH, et al. A multicenter, double-blind, randomized, controlled phase III clinical trial of chicken type II collagen in rheumatoid arthritis. Arthritis Res Ther. 2009;11(6):R180. View abstract.

Cazzola M, Antivalle M, Sarzi-Puttini P, Dell'Acqua D, Panni B, Caruso I. Oral type II collagen in the treatment of rheumatoid arthritis. A six-month double blind placebo-controlled study. Clin Exp Rheumatol. 2000;18(5):571-7. View abstract.

Thompson DJ, Barron KS, Whitcup SM, Robinson MR. The safety and efficacy of chicken type II collagen on uveitis associated with juvenile rheumatoid arthritis. Ocul Immunol Inflamm. 2002;10(2):83-91. View abstract.

Rui F, Jiawei K, Yuntao H, et al. Undenatured type II collagen prevents and treats osteoarthritis and motor function degradation in T2DM patients and db/db mice. Food Funct 2021;12(10):4373-4391. View abstract.

Fan R, Hao Y, Liu X, et al. Undenatured Type II Collagen Relieves Bone Impairment through Improving Inflammation and Oxidative Stress in Ageing db/db Mice. Molecules 2021;26(16):4942. View abstract.

Harris RB, Fonseca FLA, Sharp MH, Ottinger CR. Functional Characterization of Undenatured Type II Collagen Supplements: Are They Interchangeable?. J Diet Suppl 2021. View abstract.

Orhan C, Juturu V, Sahin E, et al. Undenatured Type II Collagen Ameliorates Inflammatory Responses and Articular Cartilage Damage in the Rat Model of Osteoarthritis. Front Vet Sci 2021;8:617789. View abstract.

Schön C, Knaub K, Alt W, Durkee S, Saiyed Z, Juturu V. UC-II Undenatured Type II Collagen for Knee Joint Flexibility: A Multicenter, Randomized, Double-Blind, Placebo-Controlled Clinical Study. J Integr Complement Med 2022;28(6):540-548. View abstract.

Shiojima Y, Takahashi M, Takahashi R, et al. Efficacy and Safety of Dietary Undenatured Type II Collagen on Joint and Motor Function in Healthy Volunteers: A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Study. J Am Nutr Assoc 2023;42(3):224-241. View abstract.

Santana ÉTN, da Cunha Machado S, Brandão Lima VN, et al. Comparison between exercise therapy and non-hydrolyzed collagen (UC-II) in functionality and quality of life in women with knee osteoarthritis: A randomized controlled clinical trial. Wien Klin Wochenschr. 2022 May 25. Epub ahead of print. View abstract.