
by chinesegary
Glucosamine, a compound first synthesized in 1876 by Dr. Georg Ledderhose, has since been rigorously investigated to fully understand the diverse Glucosamine benefits it offers for human health.
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This situation led the National Institutes of Health to fund a large, multicenter clinical trial (the GAIT trial) studying reported pain in osteoarthritis of the knee, comparing groups treated with chondroitin sulfate, glucosamine, and the combination, as well as both placebo and celecoxib. The results of this 6-month trial found that patients taking glucosamine HCl, chondroitin sulfate, or a combination of the two had no statistically significant improvement in their symptoms compared to patients taking a placebo. The group of patients who took celecoxib did have a statistically significant improvement in their symptoms. These results suggest that glucosamine and chondroitin did not effectively relieve pain in the overall group of osteoarthritis patients, but it should be interpreted with caution because most patients presented only mild pain (thus a narrow margin to appraise pain improvement) and because of an unusual response to placebo in the trial (60%). However, exploratory analysis of a subgroup of patients suggested that the supplements taken together (glucosamine and chondroitin sulfate) may be significantly more effective than placebo (79.2% versus 54%; p = 0.002) and a 10% higher than the positive control, in patients with pain classified as moderate to severe (see testing hypotheses suggested by the data).
In an accompanying editorial, Dr. Marc Hochberg also noted that “It is disappointing that the GAIT investigators did not use glucosamine sulfate … since the results would then have provided important information that might have explained in part the heterogeneity in the studies reviewed by Towheed and colleagues” But this concern is not shared by pharmacologists at the PDR who state, “The counter anion of the glucosamine salt (i.e. chloride or sulfate) is unlikely to play any role in the action or pharmacokinetics of glucosamine”. Thus the question of glucosamine’s efficacy will not be resolved without further updates or trials.
In this respect, a 6-month double-blind, multicenter trial has been recently performed to assess the efficacy of glucosamine sulfate 1500 mg once daily compared to placebo and acetaminophen in patients with osteoarthritis of the knee (GUIDE study). The results showed that glucosamine sulfate improved the Lequesne algofunctional index significantly compared to placebo and the positive control. Secondary analyses, including the OARSI responder indices, were also significantly favorable for glucosamine sulfate.
A subsequent meta-analysis of randomized controlled trials, including the NIH trial by Clegg, concluded that hydrochloride is not effective and that there was too much heterogeneity among trials of glucosamine sulfate to draw a conclusion. In response to these conclusions, Dr. J-Y Reginster in an accompanying editorial suggests that the authors failed to apply the principles of a sound systematic review to the meta-analysis, but instead put together different efficacy outcomes and trial designs by mixing 4-week studies with 3-year trials, intramuscular/intraarticular administrations with oral ones, and low-quality small studies reported in the early 1980s with high-quality studies reported in 2007.
However, currently OARSI (OsteoArthritis Research Society International) is recommending glucosamine as the second most effective treatment for moderate cases of osteoarthritis. Likewise, recent European League Against Rheumatism practice guidelines for knee osteoarthritis grants to glucosamine sulfate the highest level of evidence, 1A, and strength of the recommendation, A.
A 2009 small study has concluded that glucosamine reduces cartilage turnover in osteoarthritis patients in response to physical training.
See also
Chitosan
Chitobiose
Methylsulfonylmethane
References
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^ Scientific Opinion of the Panel on Dietetic Products Nutrition and Allergies on a request from the European Commission on the safety of glucosamine hydrochloride from Aspergillus niger as food ingredient The EFSA Journal (2009) 1099, 1-19
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^ Clinicaltrials.gov
^ Towheed TE, Maxwell L, Anastassiades TP, et al. (2005). “Glucosamine therapy for treating osteoarthritis”. Cochrane Database of Systematic Reviews (Online) (2): CD002946. doi:10.1002/14651858.CD002946.pub2. PMID 15846645.
^ Hochberg MC (February 2006). “Nutritional supplements for knee osteoarthritis–still no resolution”. The New England Journal of Medicine 354 (8): 85860. doi:10.1056/NEJMe058324. PMID 16495399.
^ Vlad SC, LaValley MP, McAlindon TE, Felson DT (July 2007). “Glucosamine for pain in osteoarthritis: why do trial results differ?”. Arthritis and Rheumatism 56 (7): 226777. doi:10.1002/art.22728. PMID 17599746.
^ a b Reginster JY (July 2007). “The efficacy of glucosamine sulfate in osteoarthritis: financial and nonfinancial conflict of interest”. Arthritis and Rheumatism 56 (7): 210510. doi:10.1002/art.22852. PMID 17599727.
^ Petersen, G.; Saxne, T.; Heinegard, D.; Hansen, M.; Holm, L.; Koskinen, S.; Stordal, C.; Christensen, H. et al. (Jul 2009). “Glucosamine but not ibuprofen alters cartilage turnover in osteoarthritis patients in response to physical training1”. Osteoarthritis and Cartilage 18: 34. doi:10.1016/j.joca.2009.07.004. ISSN 1063-4584. PMID 19679221. edit
External links
Glucosamine article, Mayo Clinic
General Glucosamine and Chondroitin Sulfate information from the Arthritis Foundation.
“UDP-N-acetylglucosamine Biosynthesis,” Diagram including IUBMB nomenclature and links.
PDR Health Summary of drug information on glucosamine from the publishers of the Physician’s Desk Reference.
“Glucosamine/Chondroitin Arthritis Intervention Trial (GAIT),” ClinicalTrials.gov registration and information.
“Effects of Oral Glucosamine on Insulin and Blood Vessel Activity in Normal and Obese People,” ClinicalTrials.gov information.
“NIH News: Efficacy of Glucosamine and Chondroitin Sulfate May Depend on Level of Osteoarthritis Pain,” Wednesday, February 22, 2006.
“Glucosamine and Chondroitin for Arthritis: Benefit is Unlikely,” Summary of and commentary on research findings, including GAIT.
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Dietary supplements
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Vitamins and minerals
Retinol (Vitamin A) B vitamins: Thiamine (B1) Riboflavin (B2) Niacin (B3) Pantothenic acid (B5) Pyridoxine (B6) Biotin (B7) Folic acid (B9) Cyanocobalamin (B12) Ascorbic acid (Vitamin C) Ergocalciferol and Cholecalciferol (Vitamin D) Tocopherol (Vitamin E) Naphthoquinone (Vitamin K) Calcium Choline Chlorine Chromium Cobalt Copper Fluorine Iodine Iron Magnesium Manganese Molybdenum Phosphorus Potassium Selenium Sodium Sulfur Zinc
Other common ingredients
AAKG Carnitine Chondroitin sulfate Cod liver oil Copper gluconate Creatine/Creatine supplements Dietary fiber Echinacea Elemental calcium Ephedra Fish oil Folic acid Ginseng Glucosamine Glutamine Grape seed extract Iron supplements Japanese Honeysuckle Krill oil Lingzhi Linseed oil Milk thistle Melatonin Red yeast rice Royal jelly Saw palmetto Spirulina St John’s wort Taurine Wheatgrass Wolfberry Yohimbine Zinc gluconate
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Anti-inflammatory products (M01A)
Pyrazolidine/Butylpyrazolidines
Ampyrone Clofezone Kebuzone Metamizole Mofebutazone Oxyphenbutazone Phenazone Phenylbutazone Sulfinpyrazone
Acetic acid derivatives
and related substances
Aceclofenac Acemetacin Alclofenac Bromfenac Bumadizone Bufexamac Diclofenac Difenpiramide Etodolac Fentiazac Indometacin Ketorolac Lonazolac Oxametacin Proglumetacin Sulindac Tolmetin Zomepirac
Oxicams
Ampiroxicam Droxicam Lornoxicam Meloxicam Piroxicam Tenoxicam
Propionic acid derivatives
Alminoprofen Benoxaprofen Dexibuprofen Dexketoprofen Fenbufen Fenoprofen Flunoxaprofen Flurbiprofen Ibuprofen Ibuproxam Indoprofen Ketoprofen Naproxen Oxaprozin Pirprofen Suprofen Tiaprofenic acid
Fenamates
Flufenamic acid Meclofenamic acid Mefenamic acid Tolfenamic acid
Coxibs
Celecoxib Etoricoxib Lumiracoxib Parecoxib Rofecoxib Valdecoxib
Other
Nabumetone Niflumic acid Azapropazone Glucosamine Benzydamine Glycosaminoglycan Magnesium salicylate Proquazone Superoxide dismutase/Orgotein Nimesulide Feprazone Diacerein Morniflumate Tenidap Oxaceprol Chondroitin sulfate
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Further research has elucidated the precise mechanisms behind many Glucosamine benefits, especially its role in supporting cartilage integrity and joint function.
Individuals seeking natural ways to support their musculoskeletal system often explore the potential Glucosamine benefits for reducing discomfort and improving mobility.
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