Glucosamine or Chondroitin: Which Works Better?

Neither is a clear winner. In the largest trial, 1,583 adults with knee osteoarthritis, glucosamine and chondroitin sulfate each failed to beat placebo for pain over 24 weeks¹. Pharmaceutical-grade chondroitin sulfate has the better recent trial record; glucosamine's best results come mostly from one brand.

Both are sold as dietary supplements in the US², and the evidence for each is covered on our glucosamine and chondroitin pages. This guide compares them head to head.

Chondroitin has a slight edge in recent analyses, but the gap is small and the evidence is inconsistent. The trials give this picture:

• GAIT (1,583 adults, 24 weeks): the response rate on placebo was 60.1%. Glucosamine was 3.9 points higher (P=0.30), chondroitin sulfate 5.3 points higher (P=0.17) and the pair 6.5 points higher (P=0.09), while celecoxib was 10.0 points higher (P=0.008)¹.
• CONCEPT (604 patients, 6 months): chondroitin sulfate 800 mg a day cut pain by 42.6 mm on a 100 mm scale, against 33.3 mm on placebo and 39.5 mm on celecoxib³.
• Network meta-analysis (10 trials, 3,803 patients): pain fell by 0.4 cm on a 10 cm scale with glucosamine and 0.3 cm with chondroitin, and the authors set a meaningful change at 0.9 cm⁴.
• Pooled placebo-controlled trials: glucosamine lowered pain by 7.41 mm and chondroitin by 8.35 mm on a 100 mm scale⁵. NCCIH counts that analysis as 29 studies and 6,120 people².
• Cochrane review of chondroitin (43 trials): pain was 10% lower in trials shorter than six months (number needed to treat 5), but the evidence was graded low and trial results varied widely (I2=70%)⁶.
• Cochrane review of glucosamine (20 trials): pain improved by 28% from baseline, yet the eight trials with adequate allocation concealment showed no benefit for pain⁷.

A 2024 meta-analysis of 25 trials reached the same split: chondroitin cut pain and improved function, glucosamine sulfate slowed joint-space narrowing, and the combination did neither⁸.

Industry-independent trials showed smaller effects than commercially funded ones (P=0.02 for the difference)⁴. Read every large effect size with that in mind.

Both are cartilage components. Glucosamine is a building block for the glycosaminoglycan molecules in cartilage, and chondroitin helps cartilage resist compression².

Supplements are made from the cartilage of cows, pigs or shellfish, or in a lab⁹. Glucosamine is harvested from shellfish shells or made synthetically¹⁰. The sources we read give no per-serving food amounts for either compound, so we can't say how much any food supplies. The trials all used supplements.

The doses in the main trials were:

• Glucosamine sulfate, 1,500 mg once daily: used in a 318-patient trial that beat placebo on the Lequesne index¹¹ and a 605-person trial that did not beat placebo for pain¹².
• Glucosamine 1,500 mg and chondroitin sulfate 1,200 mg daily: the GAIT doses, given as 500 mg and 400 mg three times a day in its 2-year phase. GAIT used glucosamine hydrochloride^{1, 13, 2}. MOVES also used the hydrochloride form (500 mg with 400 mg chondroitin sulfate, three times a day)¹⁴.
• Chondroitin sulfate, 800 mg once daily: used in the 604-patient CONCEPT trial³ and the 162-patient hand osteoarthritis trial¹⁵.

None of the trials we cite compared morning with evening dosing, so the time of day has no evidence behind it. Arthritis Foundation notes that relief can take weeks to appear⁹.

Yes, more than the choice between the two. Brand and form explain much of why trial results disagree.

• Glucosamine brand: in a meta-analysis of 25 trials (3,458 patients), 12 trials of the Rottapharm/Madaus product found large pain relief (SMD -1.07), while 13 trials of other products found none (SMD -0.11). The 3 lowest-bias trials of the Rottapharm/Madaus product showed only a small effect (SMD -0.27)¹⁶.
• Cochrane review: 10 trials of the Rotta preparation found glucosamine superior for pain (SMD -1.31), but non-Rotta trials did not (SMD -0.15)⁷.
• Sulfate or hydrochloride: in a meta-analysis of 19 trials (3,159 patients), glucosamine hydrochloride was ineffective for pain (effect size -0.03)¹⁷. Mayo Clinic says the forms are not interchangeable and bases its evidence summary on glucosamine sulfate¹⁰.
• Chondroitin brand: in 18 trials chondroitin reduced pain with high inconsistency (SMD -0.63; I2=94%). Among low-bias trials, the pharmaceutical-grade product showed more benefit (SMD -0.25) than other preparations (SMD -0.08)¹⁸.

Product quality adds another variable. When researchers analysed 25 European food supplements, most contained less chondroitin and glucosamine than the label declared (by up to 60.3%) and all showed keratan sulfate contamination¹⁹. Only 1 of 5 supplements tested in cell models acted like the pharmaceutical comparator¹⁹.

NCCIH adds that the 2019 ESCEO statement strongly recommends prescription crystalline glucosamine sulfate and prescription chondroitin sulfate for knee osteoarthritis. It discourages other glucosamine formulations and says chondroitin sulfate should be distinguished from other chondroitin products².

On pain, the evidence says no. A pooled analysis found the combination changed pain by only 0.28 mm on a 100 mm scale, against 7.41 mm for glucosamine and 8.35 mm for chondroitin alone⁵. Individual trials disagree:

• MOVES (606 patients, 6 months): chondroitin plus glucosamine hydrochloride cut WOMAC pain by 50.1%, matching celecoxib at 50.2%. There was no placebo arm¹⁴.
• A 164-patient trial of chondroitin 1,200 mg plus glucosamine sulfate 1,500 mg: pain fell 19% on the combination and 33% on placebo, so the pair was not superior²⁰.
• GAIT's moderate-to-severe pain subgroup (354 people): 79.2% responded to the combination against 54.3% on placebo, but the authors labelled this an exploratory finding¹.
• LEGS (605 people, 2 years): only the combination reduced joint-space narrowing versus placebo (by 0.10 mm), and pain did not differ between groups¹².

A network analysis of 61 trials ranked celecoxib first for pain, then the glucosamine-chondroitin combination²¹. Placebo-controlled pooling and the MOVES design explain some of the difference between these results.

What about glucosamine chondroitin with MSM?

Methylsulfonylmethane (MSM) is often added. In a 2004 trial of 118 patients, glucosamine 500 mg, MSM 500 mg or both, taken three times daily for 12 weeks, each beat placebo. The pain index fell from 1.7 to 0.36 with the combination, against 1.74 to 0.65 with glucosamine and 1.53 to 0.74 with MSM²². We found no head-to-head trial of MSM against chondroitin, so "which is better" has no direct answer.

Cartilage results are mixed. In a 3-year trial of 212 patients, joint-space width fell by 0.31 mm on placebo and 0.06 mm on 1,500 mg of glucosamine sulfate²³. The 2-year GAIT phase found no clinically important pain or function difference from placebo for any treatment¹³. The network analysis found joint-space differences that were minute⁴.

For chondroitin, a Cochrane analysis of 2 trials found a 4.7% smaller loss of minimum joint space than placebo (evidence rated high)⁶.

Other joints have less data:

• Hand: chondroitin sulfate 800 mg daily for 6 months lowered hand pain 8.7 mm more than placebo in 162 patients¹⁵. The 2019 ACR guideline conditionally recommends it for hand osteoarthritis²⁴.
• Hip: the one high-quality trial (222 people, 2 years) found glucosamine sulfate no better than placebo for hip pain, function or joint structure².
• Knee: the same ACR/Arthritis Foundation guideline strongly recommends against glucosamine and chondroitin, alone or together, as does OARSI. AAOS lists both as possibly helpful but notes the evidence is inconsistent².

For the pages that cover joint outcomes, see glucosamine for knee pain, osteoarthritis and joint comfort.

No trial we read compares them directly. A meta-analysis of 15 trials (1,670 patients) found curcuminoids lowered pain on a visual analog scale by 1.77 points versus placebo and were not inferior to NSAIDs. The authors called the studies low quality and heterogeneous²⁵.

That review compared curcuminoids with placebo and NSAIDs, not with glucosamine or chondroitin, so we can't rank them. See turmeric and curcumin for the full evidence.

For knee pain generally, the ACR guideline's strong recommendations are exercise, weight loss if you are overweight, tai chi, self-management programs, topical NSAIDs, oral NSAIDs and glucocorticoid injections into the joint²⁴. It advises trying topical NSAIDs before oral ones and using oral NSAIDs at the lowest dose for the shortest time²⁴. Acupuncture, yoga and several other options get conditional recommendations²⁴. No supplement is on the strong list for the knee².

The guideline asks clinicians to weigh each person's values, preferences and other conditions²⁴. The glucosamine and chondroitin trials measured pain, function and joint-space width, not joint lubrication^{13, 12}. For another joint-health option, see hyaluronic acid.

Both have a good short-term safety record. NCCIH reports no major safety problems in large osteoarthritis studies². Chondroitin was associated with fewer serious adverse events than placebo in six trials (Peto odds ratio 0.40)⁶. Mild effects reported with glucosamine sulfate include nausea, heartburn, diarrhea and constipation¹⁰. Mayo Clinic also warns that glucosamine sulfate taken with acetaminophen might reduce the effect of both¹⁰.

Warfarin

This is the interaction that matters. A 71-year-old on stable warfarin raised his intake to glucosamine 1,500 mg and chondroitin 1,200 mg twice daily, and his INR climbed from 2.3 to 3.9 within about three weeks. It was 2.6 sixteen days after the supplement was stopped and his warfarin schedule changed. The same report found 20 FDA MedWatch reports of altered coagulation²⁶. See our guide to blood thinners and supplements.

Shellfish allergy

Glucosamine is often shellfish-derived. In a double-blind challenge, 15 shrimp-allergic people tolerated tablets with 1,500 mg of shrimp-derived glucosamine, but the study tested specific manufacturers' products and a small sample²⁷. Mayo Clinic still lists the allergy concern, along with asthma and glaucoma¹⁰. If you have a shellfish allergy, check with a clinician and read the label.

Diabetes and blood sugar

NCCIH says glucosamine may raise blood glucose in some people². Yet 6 weeks of 500 mg three times daily did not cause insulin resistance in 20 lean and 20 obese adults²⁸, and 2.5 years of glucosamine sulfate in 407 women with a BMI of 27 or higher did not change HbA1c²⁹. People with type 2 diabetes should still monitor their glucose.

Does glucosamine lower heart disease risk?

An analysis of 466,039 UK Biobank participants linked glucosamine use to 15% fewer cardiovascular events (hazard ratio 0.85)³⁰. A later review of 11 observational glucosamine studies (of mortality, cancer and other outcomes) argued that such results can reflect selection bias. Its UK Biobank illustration showed a true mortality rate ratio of 1.0 appearing as 0.82³¹. Treat the heart benefit as unproven and don't take glucosamine to protect your heart.

NCCIH says little is known about safety in pregnancy or breastfeeding².

Use this decision rule, based on the trial designs above:

• Knee osteoarthritis: start with exercise and weight loss, which the ACR rates strongly²⁴. If you add a supplement, chondroitin sulfate 800 mg daily has the best recent placebo-controlled result, though it comes from one pharmaceutical-grade trial and goes against the guideline's recommendation^{3, 2}.
• Hand osteoarthritis: chondroitin sulfate 800 mg daily is the only one with a trial and a conditional guideline recommendation^{15, 24}.
• Hip osteoarthritis: the one high-quality trial found glucosamine no better than placebo².
• Warfarin, diabetes or glaucoma: speak to your clinician first^{10, 26}.

The key trials ran about 6 months^{3, 14}, and we found no evidence on the minimum time needed. If pain hasn't improved by then, the trials give no basis for continuing.

Because labels often misstate contents¹⁹, look for a product that names the exact form (glucosamine sulfate, chondroitin sulfate) and states the dose per serving.

For related approaches, see joint health.

Supplements in this guide

• Glucosamine
• Chondroitin Sulfate
• MSM
• Turmeric
• Hyaluronic Acid
• Collagen (Hydrolyzed)

We searched the PubMed-indexed literature for meta-analyses, Cochrane reviews and randomized trials of glucosamine, chondroitin and their combination, plus safety reports. We read 28 journal records and 3 health-organization pages (NCCIH, Mayo Clinic and the Arthritis Foundation), and cite all of them. We prioritized systematic reviews and placebo-controlled trials in adults with osteoarthritis.

Limits: many trials are short, funded by manufacturers, or tested one brand, and we found no direct trial of turmeric against either supplement. Guideline positions are taken from the guideline abstract and NCCIH's summary, not the full guideline text. Searched October 30, 2026.

1. Clegg DO, et al. Glucosamine, chondroitin sulfate, and the two in combination for painful knee osteoarthritis. N Engl J Med. 2006;354(8):795-808. doi:10.1056/NEJMoa052771 Our study summary.
2. National Center for Complementary and Integrative Health. Glucosamine and Chondroitin for Osteoarthritis: What You Need To Know. Last updated October 2023. https://www.nccih.nih.gov/health/glucosamine-and-chondroitin-for-osteoarthritis-what-you-need-to-know
3. Reginster JY, et al. Pharmaceutical-grade Chondroitin sulfate is as effective as celecoxib and superior to placebo in symptomatic knee osteoarthritis: the ChONdroitin versus CElecoxib versus Placebo Trial (CONCEPT). Ann Rheum Dis. 2017;76(9):1537-1543. doi:10.1136/annrheumdis-2016-210860
4. Wandel S, et al. 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 Our study summary.
5. Simental-Mendía M, et al. Effect of glucosamine and chondroitin sulfate in symptomatic knee osteoarthritis: a systematic review and meta-analysis of randomized placebo-controlled trials. Rheumatol Int. 2018;38(8):1413-1428. doi:10.1007/s00296-018-4077-2
6. Singh JA, et al. Chondroitin for osteoarthritis. Cochrane Database Syst Rev. 2015;1(1):CD005614. doi:10.1002/14651858.CD005614.pub2 Our study summary.
7. Towheed TE, et al. Glucosamine therapy for treating osteoarthritis. Cochrane Database Syst Rev. 2005;2005(2):CD002946. doi:10.1002/14651858.CD002946.pub2 Our study summary.
8. Rabade A, et al. 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
9. Arthritis Foundation. Glucosamine and Chondroitin for Osteoarthritis Pain. https://www.arthritis.org/health-wellness/treatment/complementary-therapies/supplements-and-vitamins/glucosamine-chondroitin-osteoarthritis-pain
10. Mayo Clinic Staff. Glucosamine. Mayo Clinic, May 2025. https://www.mayoclinic.org/drugs-supplements-glucosamine/art-20362874
11. Herrero-Beaumont G, et al. Glucosamine sulfate in the treatment of knee osteoarthritis symptoms: a randomized, double-blind, placebo-controlled study using acetaminophen as a side comparator. Arthritis Rheum. 2007;56(2):555-67. doi:10.1002/art.22371
12. Fransen M, et al. Glucosamine and chondroitin for knee osteoarthritis: a double-blind randomised placebo-controlled clinical trial evaluating single and combination regimens. Ann Rheum Dis. 2015;74(5):851-8. doi:10.1136/annrheumdis-2013-203954
13. Sawitzke AD, 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
14. Hochberg MC, et al. Combined chondroitin sulfate and glucosamine for painful knee osteoarthritis: a multicentre, randomised, double-blind, non-inferiority trial versus celecoxib. Ann Rheum Dis. 2016;75(1):37-44. doi:10.1136/annrheumdis-2014-206792
15. Gabay C, et al. Symptomatic effects of chondroitin 4 and chondroitin 6 sulfate on hand osteoarthritis: a randomized, double-blind, placebo-controlled clinical trial at a single center. Arthritis Rheum. 2011;63(11):3383-91. doi:10.1002/art.30574
16. Eriksen P, et al. Risk of bias and brand explain the observed inconsistency in trials on glucosamine for symptomatic relief of osteoarthritis: a meta-analysis of placebo-controlled trials. Arthritis Care Res (Hoboken). 2014;66(12):1844-55. doi:10.1002/acr.22376
17. Wu D, et al. Efficacies of different preparations of glucosamine for the treatment of osteoarthritis: a meta-analysis of randomised, double-blind, placebo-controlled trials. Int J Clin Pract. 2013;67(6):585-94. doi:10.1111/ijcp.12115
18. Honvo G, et al. Efficacy of Chondroitin Sulfate in Patients with Knee Osteoarthritis: A Comprehensive Meta-Analysis Exploring Inconsistencies in Randomized, Placebo-Controlled Trials. Adv Ther. 2019;36(5):1085-1099. doi:10.1007/s12325-019-00921-w
19. Restaino OF, et al. European chondroitin sulfate and glucosamine food supplements: A systematic quality and quantity assessment compared to pharmaceuticals. Carbohydr Polym. 2019;222:114984. doi:10.1016/j.carbpol.2019.114984
20. Roman-Blas JA, et al. Combined Treatment With Chondroitin Sulfate and Glucosamine Sulfate Shows No Superiority Over Placebo for Reduction of Joint Pain and Functional Impairment in Patients With Knee Osteoarthritis: A Six-Month Multicenter, Randomized, Double-Blind, Placebo-Controlled Clinical Trial. Arthritis Rheumatol. 2017;69(1):77-85. doi:10.1002/art.39819
21. Zhu X, et al. Comparative effectiveness of glucosamine, chondroitin, acetaminophen or celecoxib for the treatment of knee and/or hip osteoarthritis: a network meta-analysis. Clin Exp Rheumatol. 2018;36(4):595-602. https://pubmed.ncbi.nlm.nih.gov/29465368/
22. Usha PR, et al. Randomised, Double-Blind, Parallel, Placebo-Controlled Study of Oral Glucosamine, Methylsulfonylmethane and their Combination in Osteoarthritis. Clin Drug Investig. 2004;24(6):353-63. doi:10.2165/00044011-200424060-00005
23. Reginster JY, et al. Long-term effects of glucosamine sulphate on osteoarthritis progression: a randomised, placebo-controlled clinical trial. Lancet. 2001;357(9252):251-6. doi:10.1016/S0140-6736(00)03610-2 Our study summary.
24. Kolasinski SL, et al. 2019 American College of Rheumatology/Arthritis Foundation Guideline for the Management of Osteoarthritis of the Hand, Hip, and Knee. Arthritis Rheumatol. 2020;72(2):220-233. doi:10.1002/art.41142
25. Feng J, et al. Efficacy and safety of curcuminoids alone in alleviating pain and dysfunction for knee osteoarthritis: a systematic review and meta-analysis of randomized controlled trials. BMC Complement Med Ther. 2022;22(1):276. doi:10.1186/s12906-022-03740-9
26. Knudsen JF, et al. Potential glucosamine-warfarin interaction resulting in increased international normalized ratio: case report and review of the literature and MedWatch database. Pharmacotherapy. 2008;28(4):540-8. doi:10.1592/phco.28.4.540
27. Villacis J, et al. Do shrimp-allergic individuals tolerate shrimp-derived glucosamine?. Clin Exp Allergy. 2006;36(11):1457-61. doi:10.1111/j.1365-2222.2006.02590.x
28. Muniyappa R, et al. Oral glucosamine for 6 weeks at standard doses does not cause or worsen insulin resistance or endothelial dysfunction in lean or obese subjects. Diabetes. 2006;55(11):3142-50. doi:10.2337/db06-0714
29. Gommans YMM, et al. The Effect of Prolonged Glucosamine Usage on HbA1c Levels and New-Onset Diabetes Mellitus in Overweight and Obese Middle-Aged Women. Am J Med. 2017;130(6):731-737.e6. doi:10.1016/j.amjmed.2016.11.038
30. Ma H, et al. Association of habitual glucosamine use with risk of cardiovascular disease: prospective study in UK Biobank. BMJ. 2019;365:l1628. doi:10.1136/bmj.l1628 Our study summary.
31. Suissa K, et al. Glucosamine and lower mortality and cancer incidence: Selection bias in the observational studies. Pharmacoepidemiol Drug Saf. 2022;31(12):1272-1279. doi:10.1002/pds.5535