Arthritis Treatment Glucosamine: Benefits and Side Effects Supplement helps to ease osteoarthritis pain and improve joint health By Cathy Wong Cathy Wong Facebook Twitter Cathy Wong is a nutritionist and wellness expert. Her work is regularly featured in media such as First For Women, Woman's World, and Natural Health. Learn about our editorial process Updated on October 06, 2022 Medically reviewed by David Ozeri, MD Medically reviewed by David Ozeri, MD LinkedIn David Ozeri, MD, is a board-certified rheumatologist. He is based in Tel Aviv, Israel, where he does research at Sheba Medical Center. Previously, he practiced at New York-Presbyterian Hospital. Learn about our Medical Expert Board Print Table of Contents View All Table of Contents Why Take Glucosamine? Benefits Side Effects Drug Interactions Dosage and Preparation What to Look For Frequently Asked Questions Glucosamine is a compound found naturally in the body. It's needed to form and repair cartilage and other body tissues. Since glucosamine production slows with age, some people use glucosamine supplements to fight aging-related health conditions, such as osteoarthritis. Most supplements are made with marine-life shells, such as shrimp and crabs. This article explains how glucosamine works, and its benefits and side effects. It also covers what to look for when choosing a glucosamine supplement. Paul Bradbury / Getty Images Why Take Glucosamine? Glucosamine is thought to keep osteoarthritis in check by restoring the body's glucosamine supply and repairing damaged cartilage. Glucosamine products include: Glucosamine sulfateGlucosamine hydrochlorideN-acetyl-glucosamine Glucosamine is often combined with chondroitin sulfate, a molecule naturally present in cartilage. Chondroitin gives cartilage elasticity and is believed to prevent the destruction of cartilage by enzymes. In some cases, glucosamine is also combined with methylsulfonylmethane (MSM) in nutritional supplements. Glucosamine Uses When used in alternative medicine, proponents claim that glucosamine may help with the following health problems: Diabetes High cholesterol Inflammation Inflammatory bowel disease (such as ulcerative colitis) Osteoarthritis Rheumatoid arthritis Temporomandibular joint disorder Health Benefits Glucosamine has been widely studied with inconclusive results. It may offer health benefits including a reduction in pain, although a 2018 review published in the journal Orthopedics suggests the benefits may be due to a placebo effect. Here's a look at other key studies on glucosamine and their findings. Osteoarthritis Glucosamine may offer benefits in treating osteoarthritis, especially in the knee. An early report concluded that some preparations of glucosamine may reduce pain and improve function. The study analyzed 20 randomized controlled studies involving a total of 2,570 adults. Despite some very positive findings, though, there is mixed evidence on these claims. One of the largest glucosamine studies, sponsored by the National Institutes of Health (NIH), questioned these results. The two-year Glucosamine/Chondroitin Arthritis Intervention Trial (GAIT), compared the effectiveness of glucosamine and chondroitin in 662 people with knee osteoarthritis and concluded that neither showed any benefit in relieving knee pain. Later studies provide no clearer evidence of benefit. However, some researchers still contend that glucosamine not only helps to ease arthritis pain but also prevents cartilage loss. A separate six-year study found that cartilage loss appeared to be slowed in adults with knee osteoarthritis who had taken glucosamine and chondroitin for up to six years. The benefits appeared to be greater the longer the supplements were taken. Further research is needed to make sense of these contradictions. TMJ Glucosamine is possibly effective for temporomandibular joint (TMJ) osteoarthritis, according to a small study published in the Journal of Reseach in Pharmacy Practice. The trial involved 60 adults with TMJ who were given either glucosamine, ibuprofen, or a placebo for 90 days. Although glucosamine and ibuprofen were both more effective in relieving pain than a placebo, ibuprofen proved superior to glucosamine. Low Back Pain Glucosamine may not benefit people with chronic lower back pain and degenerative lumbar osteoarthritis, according to previous studies. However, a 2019 study from Japan reported improved function in people with lower back pain and knee pain who took glucosamine with milk-fat globule membrane (MFGM). Possible Side Effects Glucosamine side effects are typically mild and include: Nausea Heartburn Diarrhea Constipation More serious side effects, including drowsiness, skin reactions, and headache, are rare. Taking the supplements with food seems to ease side effects. People with certain health conditions should not take glucosamine supplements without consulting a healthcare provider. These diseases and disorders include: Asthma Diabetes Glaucoma High cholesterol High blood pressure Women who are pregnant or breastfeeding should not take glucosamine as there is not enough research to support its safe use. Stop taking glucosamine at least two weeks prior to scheduled surgery, as it may impact the body’s ability to regulate blood sugar. Glucosamine and Shellfish Allergies People who are allergic to shellfish should check the label as many supplements are made from the shells of lobsters, shrimp, or crabs. Glucosamine Drug Interactions Glucosamine supplements should not be taken with the blood-thinning drug Coumadin (warfarin) as it may increase its effects and cause bruising and serious bleeding. There is some evidence to suggest glucosamine may interfere with certain cancer drugs, known as topoisomerase II inhibitors. These include: Adriamycin (doxorubicin) VePesid (etoposide) Vumon (teniposide) Novantrone (mitoxantrone) Cerubidine (daunorubicin) Glucosamine may hinder the effectiveness of these drugs. Can Glucosamine Cause Liver Damage? There is some evidence that glucosamine can affect liver function, though it's not clear if that's the case in healthy people or people who already have liver damage. In one study, just two of 23 people with a liver disease who took the supplements showed changes that suggested liver damage.Talk to your healthcare provider before taking any supplement. Dosage and Preparation There is no standard recommended dose for glucosamine. The supplement is typically sold in tablets and capsules, and is often included with other supplements that may be effective for pain. It is OK to take glucosamine every day, but check with your healthcare provider. For example, with osteoarthritis, the following doses have been studied: By mouth: 1,500 milligrams (mg) per day, taken either at once, in two doses of 750 mg, or in three doses of 500 mgTopically: A cream containing 30 mg/gram of glucosamine sulfate, 50 mg/gram of chondroitin sulfate, 140 mg/gram of chondroitin sulfate, 32 mg/gram of camphor, and 9 mg/gram of peppermint oil has been applied to the skin as needed for 8 weeks.By injection: 400 mg of glucosamine sulfate injected into the muscle twice weekly for 6 weeks Can I Take Multivitamins With Glucosamine? Glucosamine is one of the four most common supplements taken by older people; the others include multivitamins and vitamin D. They also take them with prescription drugs. Researchers have found possible interactions with the drug Glucophage (metformin), and with diuretics like Lasix (furosemide), that reduce glucosamine effects. There were no such findings with vitamins. What to Look For When selecting a brand of supplements, look for products that have been certified by Consumer Labs, The U.S. Pharmacopeial Convention, or NSF International. While the supplement is sold as glucosamine sulfate, glucosamine hydrochloride, and N-acetyl-glucosamine, most of the research showing benefits has been done on glucosamine sulfate. A Word From Verywell Glucosamine may be of some benefit to people with osteoarthritis. Some healthcare providers may suggest it on a trial basis. If you're considering the use of glucosamine in the treatment of any condition, talk to your healthcare provider before starting your supplement regimen. Frequently Asked Questions Are there any food sources of glucosamine? No. There are no common foods that you can eat to get glucosamine. Glucosamine supplements are often derived from the shells of shrimp, lobster, and crabs, and consuming shells themselves in any form is not recommended. Learn More: Supplements to Take if You Have Arthritis Is glucosamine safe for long-term use? Yes. A 2016 study involving 1,593 people who had taken glucosamine and chondroitin for up to six years concluded that both supplements were safe and effective for long-term use. Learn More: Latest Research on Glucosamine and Chondroitin 10 Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Icahn School of Medicine at Mount Sinai. Glucosamine Information. DiNubile N. Glucosamine and chondroitin sulfate: What has been learned since the Glucosamine/chondroitin Arthritis Intervention Trial. Orthopedics. 2018;41(4):200-7. doi:10.3928/01477447-20180511-06 Towheed TE, Maxwell L, Anastassiades TP, et al. Glucosamine therapy for treating osteoarthritis. Cochrane Database Syst Rev. 2005;(2):CD002946. doi:10.1002/14651858.CD002946.pub2 Sawitzke AD, Shi H, Finco MF, et al. Clinical efficacy and safety of glucosamine, chondroitin sulphate, their combination, celecoxib or placebo taken to treat osteoarthritis of the knee: 2-year results from GAIT. Ann Rheum Dis. 2010;69(8):1459-64. doi:10.1136/ard.2009.120469 Raynauld JP, Pelletier JP, Abram F, et al. Long-term effects of glucosamine and chondroitin sulfate on the progression of structural changes in knee osteoarthritis: six-year followup data from the Osteoarthritis Initiative. Arthritis Care Res (Hoboken). 2016;68(10):1560-6. doi:10.1002/acr.22866 Haghighat A, Behnia A, Kaviani N, Khorami B. Evaluation of glucosamine sulfate and Ibuprofen effects in patients with temporomandibular joint osteoarthritis symptom. J Res Pharm Pract. 2013;2(1):34-9. doi:10.4103/2279-042X.114087 Suzukamo C, Ishimaru K, Ochiai R, Osaki N, Kato T. Milk-Fat Globule Membrane Plus Glucosamine Improves Joint Function and Physical Performance: A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Study. J Nutr Sci Vitaminol (Tokyo). 2019;65(3):242-250. doi:10.3177/jnsv.65.242 Cerda C, Bruguera M, Parés A. Hepatotoxicity associated with glucosamine and chondroitin sulfate in patients with chronic liver disease. World J Gastroenterol. 2013 Aug 28;19(32):5381-4. doi:10.3748/wjg.v19.i32.5381. Agbabiaka TB, Spencer NH, Khanom S, Goodman C. Prevalence of drug-herb and drug-supplement interactions in older adults: a cross-sectional survey. Br J Gen Pract. 2018 Oct;68(675):e711-e717. doi:10.3399/bjgp18X699101. University of Michigan Health. Glucosamine and chondroitin. By Cathy Wong Cathy Wong is a nutritionist and wellness expert. Her work is regularly featured in media such as First For Women, Woman's World, and Natural Health. See Our Editorial Process Meet Our Medical Expert Board Share Feedback Was this page helpful? 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