“Glucosamine relieves osteoarthritis pain.”
In large, independent trials, glucosamine eased osteoarthritis pain only slightly, by less than most patients can notice.
Glucosamine is unlikely to make a noticeable difference to osteoarthritis pain for most people. The effect in good trials is much smaller than the marketing suggests.
If you are thinking about glucosamine, ask your clinician about treatments with stronger evidence for osteoarthritis pain first. If you already take it and do not notice a clear difference, you can stop.
Safety note: Glucosamine may raise blood sugar in some people, so check your levels if you have diabetes. Glucosamine and chondroitin have been linked to bleeding in people taking the blood thinner warfarin. Little is known about safety during pregnancy or breastfeeding.
Talk to a healthcare professional if: you take warfarin, you have diabetes, you are pregnant or breastfeeding, or joint pain is keeping you from daily activities.
Large independent trials and a pooled analysis of the biggest trials agree that any pain relief from glucosamine is small, below the amount patients can notice. Confidence is Moderate because products differ and many of the positive trials are old, small or funded by the maker.
In large, independent trials, glucosamine eased osteoarthritis pain only slightly, by less than most patients can notice. In the US GAIT trial of 1,583 people with knee osteoarthritis, 64.0% of people on glucosamine had at least 20% less pain after 24 weeks, compared with 60.1% on a placebo pill, a gap that could easily be due to chance.
A pooled analysis of the 10 largest trials (3,803 people) found glucosamine lowered pain by 0.4 points on a 10-point scale. A change of about 0.9 points is the smallest most patients would notice. Independent trials found smaller effects than trials funded by companies. Most positive trials tested one prescription form, crystalline glucosamine sulfate, and many were older studies funded by its maker with design weaknesses. Trials of other glucosamine products showed no pain benefit. A 2024 review of 25 knee trials reported a pain benefit for chondroitin but not for glucosamine sulfate; its only clear glucosamine finding was less joint-space narrowing on X-rays, which is not the same as pain relief or cartilage regrowth.
The American College of Rheumatology and Arthritis Foundation (2019) strongly recommend against glucosamine for knee osteoarthritis. The Osteoarthritis Research Society International (2019) does the same. The American Academy of Orthopaedic Surgeons (2021) lists glucosamine as a supplement that may help mild to moderate knee osteoarthritis, while noting the evidence is inconsistent. A European expert group (ESCEO, 2019) supports only the prescription crystalline glucosamine sulfate product.
- Clegg DO, Reda DJ, Harris CL, et al. Glucosamine, chondroitin sulfate, and the two in combination for painful knee osteoarthritis. New England Journal of Medicine. 2006;354(8):795-808. DOI: 10.1056/NEJMoa052771. PMID: 16495392
- Wandel S, Jüni P, Tendal B, Nüesch E, Villiger PM, Welton NJ, Reichenbach S, Trelle S. Effects of glucosamine, chondroitin, or placebo in patients with osteoarthritis of hip or knee: network meta-analysis. BMJ. 2010;341:c4675. DOI: 10.1136/bmj.c4675. PMID: 20847017
- Towheed T, Maxwell L, Anastassiades TP, Shea B, Houpt J, Welch V, Hochberg MC, Wells GA. Glucosamine therapy for treating osteoarthritis. Cochrane Database of Systematic Reviews. 2005;(2):CD002946. DOI: 10.1002/14651858.CD002946.pub2
- Rabade A, Viswanatha GL, Nandakumar K, Kishore A. Evaluation of efficacy and safety of glucosamine sulfate, chondroitin sulfate, and their combination regimen in the management of knee osteoarthritis: a systematic review and meta-analysis. Inflammopharmacology. 2024;32(3):1759-1775. DOI: 10.1007/s10787-024-01460-9. PMID: 38581640
- National Center for Complementary and Integrative Health. Glucosamine and Chondroitin for Osteoarthritis: What You Need To Know. Last updated October 2023