“Effect of an Oral Preparation Containing Hyaluronic Acid, Chondroitin Sulfate, Hydrolyzed Collagen Type II and Hydrolyzed Keratin on Synovial Fluid Features and Clinical Indices in Knee Osteoarthritis. A Pilot Study”. Reumatismo 72, no. 3 (November 19, 2020): 125–130. Accessed April 26, 2025. https://www.reumatismo.org/reuma/article/view/1272.