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Glucosamine and Chondroitin

Glucosamine and chondroitin sulfate are cartilage building blocks; human studies show mixed results depending on form and joint.

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We evaluated 302 human studies on Glucosamine and Chondroitin, including 107 randomised controlled trials and 46 meta-analyses or systematic reviews; the controlled studies include 18,153 participants in total. As of 15 October 2026.

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1. What Is Glucosamine and Chondroitin? Occurrence, Origin and Forms

Glucosamine is an amino sugar and a natural building block of glycosaminoglycans, to which chondroitin sulfate also belongs. Both substances occur in the cartilage and connective tissue of humans and animals. As dietary supplements they are commonly taken for joint complaints and for osteoarthritis, either alone or as a combination.

Glucosamine and chondroitin sulfate occur naturally in joint cartilage and in other connective tissue. In use they are taken as dietary supplements, and it is exactly this intake that is examined in studies in humans.

Glucosamine is obtained from chitin, which comes from the shells of crustaceans, and chondroitin sulfate from cartilage tissue of cattle, pigs or cartilaginous fish. Studies examine mainly glucosamine sulfate, glucosamine hydrochloride and chondroitin sulfate, alone and in combination, in different preparations and over different periods of time.

Forms and Preparations Studied

  • Glucosamine sulfate
  • Glucosamine hydrochloride
  • N-acetylglucosamine
  • Chondroitin sulfate
  • Combination of glucosamine and chondroitin sulfate
  • Dietary supplements as tablets, capsules or powder

Not covered on this page:

  • Collagen and collagen hydrolysate are substances of their own and do not belong to glucosamine and chondroitin.
  • Hyaluronic acid, including injection into the joint, is a different substance.
  • MSM (methylsulfonylmethane) is a dietary supplement of its own and is not part of this topic.
  • Pain and anti-inflammatory drugs such as ibuprofen or paracetamol are medicines and not forms of glucosamine or chondroitin.

2. What Does Glucosamine and Chondroitin Do? Results by Area

AreaResult in controlled studiesStrength of evidenceStudiesParticipants
Knee Osteoarthritismixedhigh23 meta-analyses · 47 controlled · 60 other8,334
Joint Painmixedhigh20 meta-analyses · 24 controlled · 33 other2,993
Cartilage and Joint Structuremixedhigh10 meta-analyses · 21 controlled · 34 other4,309
Tolerability and Adverse Effectsmixedlow0 meta-analyses · 5 controlled · 91 other291
Hand Osteoarthritismostly improvedlow0 meta-analyses · 1 controlled · 2 other108
Hip Osteoarthritismostly no differenceunclear1 meta-analyses · 1 controlled · 3 other222
Back Painmostly no differenceunclear1 meta-analyses · 1 controlled · 3 other45
Other investigationsmixedhigh7 meta-analyses · 22 controlled · 67 other1,984

How to read the table: counted are human studies whose results concern the area. “High” means at least one meta-analysis and two controlled studies showing improvement, or at least three controlled studies of which three quarters show improvement, with at least 300 participants in total. “Moderate” means at least two controlled studies showing improvement, as a majority, or one meta-analysis alongside controlled studies. “Low” means one controlled study showing improvement. Where an area has no controlled study, the strength of evidence is at most “low” (result “reviews only” or “observational data only”). Everything else is “unclear”. A study counts as showing improvement when at least half of its outcomes in this area improved. Reviews of combination products do not count as meta-analyses; results that only describe side effects or shares of users do not count as an effect. The same study is counted only once.

3. What the Studies Show in Detail

Glucosamine and Chondroitin and Knee Osteoarthritis: Human Studies

In osteoarthritis of the knee joint, several controlled studies found improvements in pain and function with oral glucosamine sulfate 18344261119. Controlled studies also showed improvements in pain and function for chondroitin sulfate 233249. For the structure of the joint, reviews found less loss of joint space with glucosamine sulfate and chondroitin sulfate 641. Large randomized controlled trials, however, found no confirmed advantage over placebo for pain with glucosamine, chondroitin sulfate, and their combination 434548. With the combination of chondroitin sulfate and glucosamine sulfate, pain even decreased less than with placebo in one study 66. Intramuscularly injected glucosamine sulfate lowered the Lequesne index more than placebo 68. A meta-analysis found less pain than with placebo for mixtures of glucosamine with omega-3, with ibuprofen, or with chondroitin sulfate and methylsulfonylmethane 3. A mixture of glucosamine HCl, chondroitin sulfate, and manganese ascorbate relieved knee complaints more than placebo in a small study 109. It remains open whether a specific preparation, dose, or treatment duration works reliably and which patient groups benefit from it.

StudyDesign · participantsPreparation · dose · duration · comparisonResult
2 Yang et al. 2021meta-analysis · 11,890 participantsGlucosamine, chondroitin (preparation form not reported); at least 12 months follow-up; vs. Placebo and other DMOAD classes in network meta-analysiscartilage volume/minimum joint space width (structure): improved (glucosamine: SMD 0.16; 95% CI [0.04, 0.28]); pain: improved (glucosamine: pain: - 0.15 [- 0.25, - 0.05]); function: improved (glucosamine: function: - 0.17 [- 0.28, - 0.07])
6 Lee et al. 2010meta-analysis · 1,502 participantsGlucosamine sulfate and chondroitin sulfate; daily, dose not reported; 1 to 3 years; vs. placebo/controlsminimum joint space narrowing after 1 year (glucosamine sulfate): no difference (SMD 0.078, 95% CI -0.116 to -0.273, P = 0.429); minimum joint space narrowing after 3 years (glucosamine sulfate): improved (SMD 0.432, 95% CI 0.235-0.628, P < 0.001); minimum joint space narrowing after 2 years (chondroitin sulfate): improved (SMD 0.261, 95% CI 0.131-0.392, P < 0.001)
7 Wang et al. 2022meta-analysis · 764 participantsChondroitin combined with glucosamine; vs. Routine treatment or chondroitin or glucosamine aloneClinical efficacy: unclear ((4.86, 17.08))
9 Čeh et al. 2023meta-analysis · 297 participantsGlucosamine alone or glucosamine plus chondroitin, form not stated; vs. Add-on to exercise program versus exercise alonephysical function: no difference (SMD -0.13, 95% CI -0.95 to 0.69, p = 0.76)
11 McAlindon et al. 2000meta-analysis · 15 participantsGlucosamine or chondroitin preparations; at least 4 weeks; vs. Placebo, double-blind randomized; manufacturer-fundedPooled effect size glucosamine: improved (0.44 (95% CI, 0.24-0.64)); Pooled effect size chondroitin: improved (0.78 (95% CI, 0.60-0.95))
13 Chen et al. 2026meta-analysisGlucosamine/chondroitin combination (CS+GH); vs. Celecoxib, probiotics, metformin, krill oil, placebo/controlSUCRA rank for VAS pain improvement: unclear (CS+GH (0.756)); SUCRA rank for WOMAC total score: unclear (followed by CS+GH (0.756))
15 Baden et al. 2025systematic reviewglucosamine and/or chondroitin; mostly 1500 mg glucosamine plus 1200 mg chondroitin daily; vs. placebo or celecoxibpositive efficacy outcomes: improved (over 90%)
17 Rabade et al. 2024meta-analysisOral glucosamine sulfate, chondroitin sulfate, GS+CS combination; vs. Placebo-controlledPhysical function with chondroitin sulfate: improved (improved physical function); Physical function with GS+CS combination: no difference (nor any improvement in the physical function)

Further studies in this area: 18 23 26 27 29 30 31 32 34 36 37 39 40 41 42 43 44 45 46 47 49 53 54 56 57 60 61 63 64 65 66 67 68 70 71 73 74 75 76 77 79 80 82 83 84 85 87 88 89 90 91 94 96 98 99 101 106 107 115 116 118 119 121 122 125 128 129 130 142 144 147 148 150 154 155 156 158 164 165 166 167 168 169 170 179 180 182 185 186 189 191 205 206 214 219 220 221 223 225 227 228 229 230 233 234 235 236 237 238 241 243 244 245 247 251 252 253 254 255 256 258 259

Glucosamine and Chondroitin and Joint Pain: Human Studies

Meta-analyses found small to moderate relief compared with placebo in osteoarthritis pain with oral glucosamine sulfate 2841 and with chondroitin 32. A network meta-analysis, however, saw no clinically relevant difference from placebo for glucosamine, chondroitin, and their combination 4. The combination was better than placebo in a large study only for moderate to severe baseline pain 43; crystalline glucosamine sulfate did not differ from placebo in another study 60. The evidence is considered high because numerous randomized trials and several meta-analyses are available; however, the results depend strongly on the preparation tested, since glucosamine sulfate, glucosamine hydrochloride, and chondroitin sulfate cannot be exchanged for one another. Mostly oral preparations were investigated, sometimes as a single substance, sometimes as a combination; manufacturer-supported studies showed larger effects than independent ones 428. It remains open which preparation and which patient group are most likely to benefit and how the findings behave with longer use.

StudyDesign · participantsPreparation · dose · duration · comparisonResult
1 Zeng et al. 2015meta-analysis · 16,427 participantsGlucosamine, chondroitin, combination, celecoxib, placebo; vs. Placebo; celecoxib as active comparatorpain relief: improved
4 Wandel et al. 2010meta-analysis · 3,803 participantsGlucosamine, chondroitin, or their combination; vs. Placebo or head-to-head comparison of preparationsPain intensity on 10-cm VAS vs placebo (glucosamine): no difference (-0.4 cm (95% credible interval -0.7 to -0.1 cm)); Pain intensity on 10-cm VAS vs placebo (chondroitin): no difference (-0.3 cm (-0.7 to 0.0 cm)); Pain intensity on 10-cm VAS vs placebo (combination): no difference (-0.5 cm (-0.9 to 0.0 cm))
5 Towheed et al. 2005systematic review · 2,570 participantsGlucosamine, Rotta and non-Rotta preparations; up to 3 years in two RCTs; vs. placebo and NSAIDpain (SMD, all 20 RCTs): improved (SMD -0.61, 95% CI -0.95, -0.28); pain with adequate allocation concealment: no difference; pain, Rotta preparation vs. placebo: improved (SMD -1.31, 95% CI -1.99, -0.64)
7 Wang et al. 2022meta-analysis · 764 participantsChondroitin combined with glucosamine; vs. Routine treatment or chondroitin or glucosamine aloneJoint pain score: unclear; Tenderness score: unclear; Swelling score: unclear
9 Čeh et al. 2023meta-analysis · 297 participantsGlucosamine alone or glucosamine plus chondroitin, form not stated; vs. Add-on to exercise program versus exercise aloneWOMAC pain: no difference (SMD -0.18, 95% CI -0.47 to 0.11, p = 0.23); VAS pain: no difference (SMD -0.34, 95% CI -0.85 to 0.17, p = 0.20)
11 McAlindon et al. 2000meta-analysis · 15 participantsGlucosamine or chondroitin preparations; at least 4 weeks; vs. Placebo, double-blind randomized; manufacturer-fundedEffect sizes for pain and function outcomes: improved
15 Baden et al. 2025systematic reviewglucosamine and/or chondroitin; mostly 1500 mg glucosamine plus 1200 mg chondroitin daily; vs. placebo or celecoxibpositive efficacy outcomes: improved (over 90%)
17 Rabade et al. 2024meta-analysisOral glucosamine sulfate, chondroitin sulfate, GS+CS combination; vs. Placebo-controlledPain intensity with chondroitin sulfate: improved (significant reduction in pain intensity); Pain intensity with GS+CS combination: no difference (neither a reduction in pain intensity)

Further studies in this area: 22 25 26 27 28 29 30 32 35 39 41 42 48 56 60 66 67 69 72 73 74 75 80 82 89 90 92 94 96 97 98 110 115 121 123 126 129 142 145 146 148 150 157 158 162 163 164 167 170 171 172 205 206 208 209 211 216 218 222 227 231 238 240 246 248 249 250 257 260

Glucosamine and Chondroitin, Cartilage and Joint Structure: Human Studies

In knee osteoarthritis, joint space narrowed less with oral glucosamine sulfate than with placebo in two randomized controlled trials over three years 61122. A review found this also for chondroitin 32, while a meta-analysis for glucosamine sulfate found only a small effect 28. For the combination of glucosamine and chondroitin sulfate, the picture is inconsistent: one randomized controlled trial found less joint space narrowing after two years than with placebo 48, two meta-analyses found no difference 417. On MRI, the knee lost less cartilage volume with chondroitin sulfate than with placebo 92; with glucosamine, two controlled studies found no structural advantage on MRI 5262. The robustness is considered high because many randomized trials and several meta-analyses are available; however, the results depend strongly on the form tested, and glucosamine sulfate, glucosamine hydrochloride, and chondroitin sulfate are not interchangeable. It remains open which patients and which osteoarthritis stages actually benefit structurally from which preparation.

StudyDesign · participantsPreparation · dose · duration · comparisonResult
1 Zeng et al. 2015meta-analysis · 16,427 participantsGlucosamine, chondroitin, combination, celecoxib, placebo; vs. Placebo; celecoxib as active comparatorreduction in joint space narrowing: improved (statistically significant)
4 Wandel et al. 2010meta-analysis · 3,803 participantsGlucosamine, chondroitin, or their combination; vs. Placebo or head-to-head comparison of preparationsChange in minimal joint space width: no difference (95% credible intervals overlapping zero)
5 Towheed et al. 2005systematic review · 2,570 participantsGlucosamine, Rotta and non-Rotta preparations; up to 3 years in two RCTs; vs. placebo and NSAIDradiological progression of knee OA (Rotta): improved (SMD 0.24, 95% CI 0.04, 0.43)
17 Rabade et al. 2024meta-analysisOral glucosamine sulfate, chondroitin sulfate, GS+CS combination; vs. Placebo-controlledTibiofemoral joint space narrowing with glucosamine sulfate: improved (significant reduction in tibiofemoral joint space narrowing); Joint space narrowing with GS+CS combination: no difference (non-significant reduction in joint space narrowing)
25 Liu et al. 2018systematic reviewOral dietary supplements, including glucosamine and chondroitin; Short term, medium term and long term; vs. PlaceboStructural improvement: improved (effect size -0.30, -0.42 to -0.17)
28 Knapik et al. 2018meta-analysisOral glucosamine sulfate; various dosages, including 1500 mg once daily; vs. PlaceboJoint space narrowing (SMD): no difference (-0.10 (95% CI -0.23 to +0.04))
32 Singh et al. 2015systematic revieworal chondroitin; from 1 month to 3 years; vs. placebo, NSAIDs/analgesics/opioids, glucosamine or other herbal medicationsloss of minimum joint space width: improved (4.7% less (95% CI 1.6% to 7.8% less))
33 Gallagher et al. 2015systematic revieworal glucosamine; chondroitin sulfate; trials of at least 12 months; vs. placeboradiographic cartilage loss: improved (3 of 4 studies); structural effect on radiographs: improved (2 of 3 trials)

Further studies in this area: 39 42 44 47 48 50 52 56 59 60 61 62 72 74 75 79 89 90 92 93 94 117 122 123 147 153 162 163 171 176 192 194 202 203 204 205 208 209 211 213 216 226 227 228 229 238 240 243 245 246 247 248 249 250 253 254 259

Glucosamine and Chondroitin, Tolerability and Adverse Effects: Human Studies

For the tolerability of glucosamine and chondroitin sulfate, the controlled studies show a largely unremarkable picture. In several randomized controlled studies, the tolerability of glucosamine sulfate did not differ from placebo 5761119122. According to a review, serious adverse events occurred less frequently with chondroitin than with placebo 32. Individual studies reported fewer adverse events with glucosamine sulfate compared to ibuprofen 6497. A randomized controlled study also found fewer drug-related study discontinuations with glucosamine sulfate than with ibuprofen 65. In a small study on temporomandibular joint osteoarthritis, more participants reported gastrointestinal complaints with glucosamine sulfate than with placebo 100. Overall, the evidence is low, the studies are mostly small, short, and examine different preparations, so the transferability to all forms is limited.

StudyDesign · participantsPreparation · dose · duration · comparisonResult
1 Zeng et al. 2015meta-analysis · 16,427 participantsGlucosamine, chondroitin, combination, celecoxib, placebo; vs. Placebo; celecoxib as active comparatorthree major adverse effects (withdrawal, serious, number of patients); gastrointestinal adverse effect with celecoxib vs placebo (higher rate)
2 Yang et al. 2021meta-analysis · 11,890 participantsGlucosamine, chondroitin (preparation form not reported); at least 12 months follow-up; vs. Placebo and other DMOAD classes in network meta-analysissafety profile (both had favorable safety profiles)
5 Towheed et al. 2005systematic review · 2,570 participantsGlucosamine, Rotta and non-Rotta preparations; up to 3 years in two RCTs; vs. placebo and NSAIDadverse reactions vs. placebo (RR=0.97, 95% CI, 0.88, 1.08)
7 Wang et al. 2022meta-analysis · 764 participantsChondroitin combined with glucosamine; vs. Routine treatment or chondroitin or glucosamine aloneIncidence of adverse reactions
12 Calzada-Gonzales et al. 2026systematic review · 7 participantsOral glucosamine (unspecified preparation); 3 to 12 months; vs. Placebo or active controlAdverse and serious adverse events
15 Baden et al. 2025systematic reviewglucosamine and/or chondroitin; mostly 1500 mg glucosamine plus 1200 mg chondroitin daily; vs. placebo or celecoxibadverse effects (minimal or no adverse effects)
17 Rabade et al. 2024meta-analysisOral glucosamine sulfate, chondroitin sulfate, GS+CS combination; vs. Placebo-controlledSafety profile of CS and GS (good safety profile and were well tolerated)
18 Vo et al. 2023systematic revieworal glucosamine, stated as glucosamine sulfate; glucosamine sulfate 1500 mg/day; long-term treatment, duration not stated; vs. placeboserious adverse events and interactions (no reports of serious medication interactions or significant adverse events)

Further studies in this area: 25 27 28 29 31 32 34 41 42 44 45 46 47 48 49 57 60 61 63 64 65 66 71 75 76 77 78 82 84 89 91 93 97 98 99 100 101 103 105 106 112 113 114 115 117 118 119 120 122 127 128 148 149 150 151 153 154 157 158 159 160 161 167 170 171 172 177 196 198 205 207 208 213 215 217 218 225 227 234 244 245 246 247 248 251 252 254 260

Glucosamine and Chondroitin and Hand Osteoarthritis: Human Studies

In hand osteoarthritis, hand pain and hand function improved more in two retrospective observational studies when glucosamine sulfate was added to usual therapy than with usual therapy alone 78160. The evidence is low because placebo-controlled studies are still pending and all participants also had knee osteoarthritis. It remains open whether the findings apply to other preparations such as glucosamine hydrochloride or chondroitin sulfate alone.

StudyDesign · participantsPreparation · dose · duration · comparisonResult
78 Tenti et al. 2020controlled · 108 participantscrystalline glucosamine sulfate plus conventional therapy; 1500 mg once daily; 6 months; vs. conventional therapy alone (exercise, acetaminophen/NSAIDs)hand pain (VAS): improved (p < 0.001); Functional Index for Hand Osteoarthritis (FIHOA): improved (p < 0.001)
160 Tenti et al. 2022case-control study · 123 participantsprescription-grade crystalline glucosamine sulfate (pCGS); 1500 mg/day; 6 months; vs. usual therapy plus pCGS vs. usual therapy alonehand pain (VAS): improved (p < 0.01); Functional Index for Hand Osteoarthritis (FIHOA): improved (p < 0.001); morning stiffness duration: improved (p < 0.05)
162 Scarpellini et al. 2008cohort study · 104 participantsGlucosamine + chondroitin sulfate (GC) or plus type II collagen (GCC); 1 year; vs. GC alone vs GCC (no placebo control), baseline vs follow-upRadiological score (Kellgren and Lawrence, hands), GCC: improved (P < 0.05)

Glucosamine and Chondroitin and Hip Osteoarthritis: Human Studies

In hip osteoarthritis, oral glucosamine sulfate was not better than placebo for WOMAC pain and function in a two-year randomized controlled study 5859. A review on glucosamine and chondroitin also saw no clinically relevant benefit in knee and hip osteoarthritis 36. The evidence is considered unclear because the controlled investigations are limited to a single preparation. It remains open whether other forms such as glucosamine hydrochloride or chondroitin sulfate perform differently in the hip joint.

StudyDesign · participantsPreparation · dose · duration · comparisonResult
36 Lopes et al. 2013systematic reviewGlucosamine and chondroitin; vs. Placebo or control groups in the included studiesclinically relevant benefit: no difference (does not provide clinical relevant benefits)
59 Rozendaal et al. 2008randomised controlled · 222 participantsOral glucosamine sulfate or placebo; 1500 mg once daily; 2 years; vs. Glucosamine sulfate versus placeboWOMAC pain over 24 months: no difference (-1.54 [95% CI, -5.43 to 2.36]); WOMAC function over 24 months: no difference (-2.01 [CI, -5.38 to 1.36])
148 Lila et al. 2023cohort study · 1,102 participantsOral capsules glucosamine hydrochloride 500 mg + chondroitin sulfate 400 mg; 3 capsules daily for 3 weeks, then 2 capsules daily; Observation up to 54-64 weeks, 4 visits; vs. Before-after observation, no control groupHOOS Pain score increase: improved (22.81); HOOS Symptoms score increase: improved (19.93); HOOS Physical Function score increase: improved (18.77)
206 Deal et al. 1999review · 227 participantsGlucosamine, chondroitin sulfate, sometimes combined; collagen hydrolysate mentioned; Glucosamine 1500 mg/day, chondroitin sulfate 1200 mg/day; Glucosamine trials >4 weeks; chondroitin up to 150–180 days; vs. Placebo or NSAID (ibuprofen)Improvement in global pain score/Lequesne index in hip/knee OA: improved (39.5% [S.D. 21.9] for glucosamine, 40.2% [S.D. 6.4] for chondroitin)
212 Nicholas et al. 2023reviewGlucosamine (form not specified); vs. Society recommendations versus other non-operative optionsRecommendation against glucosamine: worsened

Glucosamine and Chondroitin and Back Pain: Human Studies

For chronic back pain, a systematic review found no difference in function with oral glucosamine and conflicting results for pain 8. In a subanalysis of a randomized controlled trial, Modic changes of the vertebral bodies and bright zones in the annulus fibrosus on MRI did not change differently with oral glucosamine sulfate than with placebo 102. A small placebo-controlled trial with a mixture of glucosamine HCl, chondroitin sulfate and manganese ascorbate could neither show nor rule out a benefit for degeneration of the lumbar spine 109. In a non-randomized trial, pain decreased most markedly when injected chondroitin sulfate was added to standard therapy, followed by a mixture with glucosamine sulfate and type II collagen 124. The strength of evidence is unclear because only a small placebo-controlled trial with glucosamine alone is available 102; the forms and combinations tested differ greatly.

StudyDesign · participantsPreparation · dose · duration · comparisonResult
8 Sodha et al. 2013systematic review · 309 participantsOral glucosamine, preparation form not stated; vs. Placebo or control (three RCTs, n=309)Function (Roland-Morris Disability Questionnaire): no difference (no change in the Roland-Morris Disability Questionnaire score in all studies); Pain score: unclear (Conflicting evidence was demonstrated with pain scores)
38 Stuber et al. 2011systematic reviewGlucosamine, chondroitin sulfate and methylsulfonylmethane; vs. Placebo or no interventionEfficacy for spinal degeneration (supplement vs. placebo): no difference (negative results for the supplemented group compared with placebo); Efficacy for spinal degeneration (supplement vs. no intervention): improved (significant positive results for the supplemented group when compared with a no intervention control group)
102 Wilkens et al. 2012randomised controlled · 45 participantsoral glucosamine sulfate; 6-month intake, 6-18 months follow-up; vs. glucosamine (n=19) vs. placebo (n=26)proportion of MC with decreased type: no difference (OR 1.6; 95% CI 0.4-6.1); increased type I dominance: no difference (OR placebo:GS 2.4; 95% CI 0.6-9.7); proportion of MC with increased size: no difference (OR 1.0; 95% CI 0.2-4.7)
161 Shavlovskaya et al. 2025cohort study · 120 participantsChondroguard TRIO (CS+GS+UC-II), Artra/Teraflex (CS+GG), Dona (GS); September 2024 to May 2025; vs. Chondroguard TRIO versus Artra, Teraflex and DonaPain intensity (VAS): improved (statistically significant decrease in pain syndrome values); Functional status (Oswestry Disability Index): unclear
176 Samushiia et al. 2006case series · 6 participantsglucosamine sulfate and chondroitin sulfate; long-term use; vs. no control groupalternative treatment of discogenic radiculopathy: improved

Glucosamine and Chondroitin: Further Outcomes in Studies

For temporomandibular joint complaints, the mouth opened wider with the combination of glucosamine and chondroitin sulfate than with tramadol in a small randomized trial 110. For temporomandibular joint osteoarthritis, glucosamine sulfate was not better than placebo 100 and relieved pain similarly to or more than ibuprofen 97103. For the combination of glucosamine and chondroitin sulfate, a randomized controlled trial showed no difference in the need for rescue medication 66. One randomized controlled trial with glucosamine sulfate reported an increase in intraocular pressure 86, while another found no difference 104. Overall, the evidence is high, but the results differ markedly by the form tested, dose and comparison group; most studies tested glucosamine sulfate or the combination with chondroitin sulfate.

StudyDesign · participantsPreparation · dose · duration · comparisonResult
10 Lapaeva et al. 2023systematic review · 186 participantsDietary supplements: glucosamine, leucine, creatine, vitamins E and C, whey protein; vs. Placebo group or no supplementary interventionMaximum strength of the operated limb (glucosamine study): no difference; Muscle hypertrophy of the operated limb (glucosamine study): no difference
11 McAlindon et al. 2000meta-analysis · 15 participantsGlucosamine or chondroitin preparations; at least 4 weeks; vs. Placebo, double-blind randomized; manufacturer-fundedEffects diminished when only high-quality or large trials considered: unclear
12 Calzada-Gonzales et al. 2026systematic review · 7 participantsOral glucosamine (unspecified preparation); 3 to 12 months; vs. Placebo or active controlPain in TMJ OA at ≤3 months: no difference (MD -1.58 mm; 95% CI -5.98 to 2.83); Pain in TMJ OA at 6 months: no difference (MD -7.02 mm; 95% CI -11.95 to -2.09); Quality of life in TMJ OA at 12 months: improved (MD -4.14; 95% CI -6.41 to -1.87)
13 Chen et al. 2026meta-analysisGlucosamine/chondroitin combination (CS+GH); vs. Celecoxib, probiotics, metformin, krill oil, placebo/controlSafety (SUCRA)
19 Derwich et al. 2023systematic revieworal glucosamine; longer administration, e.g. 3 monthstotal administration time as the most important factor affecting clinical efficacy: unclear; TMJ pain with longer administration (3 months): improved (significant reduction in TMJ pain); maximum mouth opening with longer administration (3 months): improved (significant increase in maximum mouth opening)
20 Vo et al. 2023systematic reviewGlucosamine with or without other formulations; vs. Glucosamine (pCGS) vs. other glucosamine formulations or conventional carecost-effectiveness (ICER): improved; quality-adjusted life years (QALYs): improved; pCGS vs. other glucosamine formulations: unclear
21 Khan et al. 2022systematic reviewGlucosamine and chondroitin sulfate combinedcolorectal cancer incidence: improved (decreased incidence of colorectal cancer)
24 Shmagel et al. 2019systematic reviewOral glucosamine sulfate or chondroitin sulfate supplements; vs. Varied designs, supplementation protocols and microbiome assessment methodsAbundance of Bacteroides with chondroitin sulfate: unclear (moderate-quality evidence for an association ... increased abundance of genus Bacteroides); Abundance of Desulfovibrio piger with chondroitin sulfate: unclear (low-quality evidence for an association ... increase in Desulfovibrio piger); Abundance of Bacteroidales S24-7 family with chondroitin sulfate: unclear (low-quality evidence for an association ... increase in Bacteroidales S24-7 family)

Further studies in this area: 46 51 56 66 67 69 73 75 78 81 85 86 87 89 95 96 97 99 100 103 104 105 106 108 110 111 114 120 125 126 131 132 133 134 135 136 137 138 139 140 141 142 143 146 148 150 152 153 157 163 164 165 170 171 172 173 174 175 178 181 183 184 187 188 190 193 194 195 197 199 200 201 206 210 211 214 217 223 224 229 231 232 238 239 242 246 247 248

4. How Is Glucosamine and Chondroitin Dosed? Preparation, Dose and Duration in Studies

The studies mainly used oral preparations in tablet, capsule, or powder form, alone or as a combination. Glucosamine sulfate 57, glucosamine hydrochloride 67, chondroitin sulfate 49, and N-acetylglucosamine 93 were tested, mostly for oral use; glucosamine sulfate was also injected intramuscularly in one study 68. The combination of glucosamine and chondroitin sulfate was compared with placebo or celecoxib in several large randomized controlled trials 43454748.

Preparation or formDoseDurationStudy
glucosamine, chondroitin sulfate, combination, celecoxib, or placebo1500 mg glucosamine daily, 1200 mg chondroitin sulfate daily, 200 mg celecoxib daily24 weeks43
Glucosamine, chondroitin sulphate, combination, celecoxib or placeboGlucosamine 500 mg three times daily, CS 400 mg three times daily, celecoxib 200 mg daily24 months45
Chondroitin sulfate plus glucosamine hydrochloride400 mg CS plus 500 mg GH three times daily6 months47
glucosamine sulfate, chondroitin sulfate or combination capsulesglucosamine sulfate 1500 mg, chondroitin sulfate 800 mg, combination, once daily2-year follow-up48
Pharmaceutical-grade chondroitin sulfate (CS)800 mg/day6 months (182 days)49
Glucosamine, chondroitin sulfate, combination, celecoxib, or placeboGlucosamine 500 mg 3 times daily, CS 400 mg 3 times daily, celecoxib 200 mg daily24 months50
oral crystalline glucosamine sulfate vs placebo—2.5-year intervention, 6.5-year follow-up51
glucosamine sulphate, double-blind, placebo-controlled—2.5 years52
oral crystalline glucosamine sulfate vs. placebo1500 mg once daily2.5 years53
oral glucosamine sulfate, double-blind, placebo-controlled—2.5 years54
glucosamine sulfate versus placebo—3 years55
Chondroitin sulphate1 g/day24 weeks56
Oral glucosamine sulfate versus placebo500 mg three times daily4 weeks57
Oral glucosamine sulphate 1500 mg1500 mg once daily2 years58
Oral glucosamine sulfate or placebo1500 mg once daily2 years59

5. Is Glucosamine and Chondroitin Safe? Side Effects in Studies

In randomized controlled trials, glucosamine sulfate was similarly well tolerated as placebo 57119122 and caused fewer adverse events than ibuprofen 646597. Gastrointestinal complaints were reported by more participants taking glucosamine sulfate than placebo in a small study on temporomandibular joint osteoarthritis 100. One study found an increase in intraocular pressure with glucosamine, especially in older adults 86, while another did not 104.

StudyReported side effects
1 Zeng et al. 2015No difference in three major adverse effects; celecoxib more GI adverse effects vs placebo
2 Yang et al. 2021both had favourable safety profiles
3 Sumsuzzman et al. 2024glucosamine plus omega-3 most favorable for adverse events
5 Towheed et al. 2005glucosamine as safe as placebo (RR 0.97)
7 Wang et al. 2022No significant difference in adverse reactions
12 Calzada-Gonzales et al. 2026Adverse and serious adverse events very uncertain
13 Chen et al. 2026Safety rankings: probiotics and metformin most favorable
14 Park et al. 2025Safety profile: risk ratios did not differ significantly between treatment and control groups
15 Baden et al. 2025mostly minimal or no adverse effects
16 Migliore et al. 2025combination could minimize systemic adverse effects
17 Rabade et al. 2024CS and GS well tolerated, good safety profile
18 Vo et al. 2023no serious drug interactions or significant adverse events reported

6. What Remains Open: Limits of the Evidence

  • It remains open whether a specific preparation, dose, or treatment duration works reliably and which patient groups benefit from it.
  • The results depend strongly on the form tested, since glucosamine sulfate, glucosamine hydrochloride, and chondroitin sulfate are not interchangeable.
  • Many studies are small, short, and investigate different preparations, which limits generalizability.
  • In hip osteoarthritis, controlled investigations are limited to a single preparation.
  • N-acetylglucosamine has so far only been tested in healthy people with cartilage markers 93117; studies in osteoarthritis are still pending.

7. Bottom Line: What Is Established About Glucosamine and Chondroitin

Glucosamine and chondroitin sulfate are natural building blocks of glycosaminoglycans and are taken as dietary supplements for joint complaints and osteoarthritis. Human studies show a mixed picture: in knee osteoarthritis and joint pain, several controlled studies found improvements in pain and function with oral glucosamine sulfate and chondroitin sulfate, while others saw no difference from placebo. For joint structure, there are indications of less loss of joint space, but here too the results are not uniform. In hip osteoarthritis, glucosamine sulfate was not better than placebo in a large study. Tolerability was mostly unremarkable, but the evidence for side effects is low. The form tested is decisive: glucosamine sulfate, glucosamine hydrochloride, and chondroitin sulfate are distinct preparations and are not interchangeable.

Frequently Asked Questions

How well has Glucosamine and Chondroitin been studied in humans?

We evaluated 302 human studies on Glucosamine and Chondroitin, including 107 randomised controlled trials and 46 meta-analyses or systematic reviews; the controlled studies include 18,153 participants in total. As of 15 October 2026.

Does Glucosamine and Chondroitin help with knee Osteoarthritis? What the studies show

We evaluated 23 meta-analyses or systematic reviews, 47 controlled studies and 60 further studies; the controlled studies include 8,334 participants in total. Result of the controlled studies: mixed. Strength of evidence under our published rules: high. Sources: 2679

Does Glucosamine and Chondroitin help with joint Pain? What the studies show

We evaluated 20 meta-analyses or systematic reviews, 24 controlled studies and 33 further studies; the controlled studies include 2,993 participants in total. Result of the controlled studies: mixed. Strength of evidence under our published rules: high. Sources: 1457

Does Glucosamine and Chondroitin help with cartilage and Joint Structure? What the studies show

We evaluated 10 meta-analyses or systematic reviews, 21 controlled studies and 34 further studies; the controlled studies include 4,309 participants in total. Result of the controlled studies: mixed. Strength of evidence under our published rules: high. Sources: 14517

Does Glucosamine and Chondroitin help with tolerability and Adverse Effects? What the studies show

We evaluated 5 controlled studies and 91 further studies; the controlled studies include 291 participants in total. Result of the controlled studies: mixed. Strength of evidence under our published rules: low. Sources: 1257

Does Glucosamine and Chondroitin help with hand Osteoarthritis? What the studies show

We evaluated one controlled study and 2 further studies; the controlled studies include 108 participants in total. Result of the controlled studies: mostly improved. Strength of evidence under our published rules: low. Sources: 78160162

Does Glucosamine and Chondroitin help with hip Osteoarthritis? What the studies show

We evaluated one meta-analysis or systematic review, one controlled study and 3 further studies; the controlled studies include 222 participants in total. Result of the controlled studies: mostly no difference. Strength of evidence under our published rules: unclear. Sources: 3659148206

What is the difference between glucosamine sulfate and glucosamine hydrochloride?

Glucosamine sulfate and glucosamine hydrochloride are different salts of the amino sugar glucosamine. In studies, they showed different results, and they are not interchangeable. Most positive findings in knee osteoarthritis relate to glucosamine sulfate 18344261119, while glucosamine hydrochloride alone 67 or with chondroitin sulfate 85 did not perform better than placebo.

Does the combination of glucosamine and chondroitin sulfate help better than the individual substances?

The study situation is mixed. In large randomized controlled trials, the combination was overall not better than placebo for pain 434548, and in another even weaker 66. A meta-analysis, however, found the combination more effective than usual treatment 7. Results from combination arms cannot be attributed to the individual substance alone.

Which side effects are known?

Individual studies reported fewer adverse events with glucosamine sulfate compared with ibuprofen 6497. Gastrointestinal complaints were reported by more participants taking glucosamine sulfate than placebo in a small study on temporomandibular joint osteoarthritis 100. One study found an increase in intraocular pressure with glucosamine, especially in older adults 86, while another did not 104.

Does glucosamine or chondroitin work in osteoarthritis of the hip joint?

In osteoarthritis of the hip joint, oral glucosamine sulfate was not better than placebo for WOMAC pain and function in a two-year randomized controlled trial 5859. A review on glucosamine and chondroitin also saw no clinically relevant benefit in knee and hip osteoarthritis 36. The evidence is considered unclear because the controlled investigations are limited to a single preparation.

Can glucosamine or chondroitin protect cartilage?

In knee osteoarthritis, joint space narrowed less with oral glucosamine sulfate than with placebo in two randomized controlled trials over three years 61122. A review found this also for chondroitin 32, while a meta-analysis for glucosamine sulfate found only a small effect 28. For the combination of glucosamine and chondroitin sulfate, the picture is inconsistent: one randomized controlled trial found less joint space narrowing after two years than with placebo 48, two meta-analyses found no difference 417. The results depend strongly on the form tested.

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Every statement on this page carries its evidence tier — proven, plausible or hypothesis — and leads to the original work. The decision in the individual case rests with the practitioner; we provide the connections.

International Health Research · https://ih-research.com/en/knowledge/glucosamine-and-chondroitin/ · Last updated: 2026-10-15