title: Recent advances in glucosamine and chondroitin supplementation.
abstract: Glucosamine and chondroitin are alternative solutions to previous pharmaceutical options for the treatment of osteoarthritis. This article describes the mechanisms of action, pharmacokinetics, recent findings, and upcoming studies of these two natural remedies. The majority of studies on the mechanisms behind glucosamine and chondroitin have been performed in vitro or on animal models; however, the results have shown favorable effects on the balance between cartilage matrix synthesis and degradation. The pharmacokinetics of the three main forms of glucosamine were compared, and glucosamine hydrochloride displayed the greatest compound purity, despite the compounds having equal oral absorption rates of 90%. Chondroitin sulfate has been the principal clinical formulation with a slightly lower oral absorption of 70%. Clinical trials were evaluated based on two categories-radiographic changes and symptom improvement of pain and function. Although adverse effects of these two remedies were minor, the quality and labeled quantity of these relatively unregulated products must be considered. More randomized controlled studies on humans in vivo need to evaluate the efficacy, long-term effects, and quality of these compounds.
authors.affiliation: Department of Orthopedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, Calif, USA.
authors.forename: Stephen
authors.initials: S
authors.lastname: Owens
authors.forename: Phillip
authors.initials: P
authors.lastname: Wagner
authors.forename: C Thomas
authors.initials: CT
authors.lastname: Vangsness
mesh_terms: D002358:Cartilage, Articular / Q000503:physiopathology; D002809:Chondroitin Sulfates / Q000494:pharmacology*; D002986:Clinical Trials as Topic; D004359:Drug Therapy, Combination; D005944:Glucosamine / Q000494:pharmacology*; D006801:Humans; D020370:Osteoarthritis, Knee / Q000188:drug therapy* / Q000503:physiopathology
chemical_list: D002809:Chondroitin Sulfates; D005944:Glucosamine