Glucosamine + Chondroitin

Chondroprotector. Glucosamine sulfate and chondroitin sulfate as monoproducts are registered by AEMPS as medicines for symptomatic treatment of mild-to-moderate knee osteoarthritis (Xicil, Pharma Mar; Condrosulf, Condrosan, Bioiberica). Fixed combinations are more often dietary supplements. In Russia, Dona and Structum are registered as medicines

ATC code: M01AX05

Brand names – supplements: Osteo Bi-Flex Triple Strength, Move Free Advanced (Schiff), Doctor's Best Glucosamine Chondroitin MSM, Now Foods Glucosamine & ChondroitinSupplements are not tested in clinical trials and are not registered as medications.

Updated 24 Sep 2026 · Methodology

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

Anti-aging and longevity

Not recommended

Glucosamine and chondroitin are cartilage components long sold as joint supplements, and more recently marketed for slowing aging and extending lifespan. The benefit for this use has not been shown: there is no evidence base supporting an anti-aging effect or any impact on longevity. What actually helps with healthy aging is different – movement, sleep, nutrition, and managing risk factors like blood pressure and blood sugar. The substance itself is harmless in this role, but there is no reason to expect a rejuvenating effect.

Sources

Knee osteoarthritis

Not recommended

Glucosamine and chondroitin are widely sold and prescribed for knee osteoarthritis. AEMPS registered Xicil (glucosamine sulfate 1500 mg) and Condrosulf/Condrosan (chondroitin sulfate 400 mg × 3 times) for symptomatic treatment of mild-to-moderate knee OA. In Russia, Dona and Structum are also registered as medicines. Evidence base is contradictory and weak in large independent trials. The largest independent RCT GAIT (Clegg 2006, NEJM, 1583 patients) showed no significant effect of glucosamine, chondroitin or combination monotherapy vs placebo. Wandel 2010 network meta-analysis (BMJ, 10 RCTs, 3803 patients, including GAIT) confirmed no clinically significant effect. Cochrane Towheed 2005 found an effect only in Rotta-sponsored glucosamine sulfate RCTs; not in independent ones. 2019 does not recommend glucosamine and chondroitin for routine use. NG226 2022 does not recommend either option. ESCEO 2014 recommends only prescription crystalline glucosamine sulfate (pCGS) Rottapharm in mild disease as first-line – a position criticised for conflict of interest. First-line for knee OA is non-pharmacological (weight loss at BMI>25, quadriceps-strengthening exercise), topical NSAIDs (diclofenac gel), paracetamol as option, intra-articular steroid if insufficient effect. If glucosamine-chondroitin was offered as a substitute for exercise therapy and weight loss, consider seeking a second opinion from a rheumatologist.

The distinction between pharmaceutical glucosamine sulphate (Dona, Structum) and over-the-counter glucosamine hydrochloride is important: positive RCTs mainly used the sulphate form at 1,500 mg daily.

Sources

ICD-10: M17 · ICD-11: FA01

Osteoarthritis

Not recommended

Glucosamine-chondroitin is used in hip, hand and generalised osteoarthritis. Evidence base is weaker in hip and hand OA than in knee OA. Wandel 2010 (BMJ, 10 RCTs, 3803 patients) in hip and knee OA showed no clinically significant effect of any option. 2018 in hand OA and NG226 2022 in any-site OA do not recommend glucosamine and chondroitin. First-line for OA is non-pharmacological (weight loss in hip and knee OA, base-of-thumb splinting in rhizarthrosis, exercise), topical NSAIDs, paracetamol as option, short courses of systemic NSAIDs, intra-articular steroid for knee and hip when insufficient effect. For severe OA – referral to orthopaedics for arthroplasty discussion. If glucosamine-chondroitin was offered as a substitute for exercise therapy and topical NSAIDs, consider seeking a second opinion from a rheumatologist.

Sources

ICD-10: M19 · ICD-11: FA0Z

How to read tiers A–F

AStrong evidence – first or second line in international guidelines
BRecommended in selected cases
CStudy data contradict each other
DBenefit not proven, no documented harm
FDocumented harm, or risk without benefit

Mechanism of action

Glucosamine is an aminomonosaccharide, precursor of glycosaminoglycans and proteoglycans of articular cartilage. Obtained from crustacean shells or enzymatic synthesis. Chondroitin is a sulfated glycosaminoglycan isolated from bovine, porcine or shark cartilage – a long chain of repeating disaccharides of glucuronic acid and N-acetylgalactosamine sulfate. Oral bioavailability of glucosamine sulfate is 26%, chondroitin sulfate – 5–15% due to large molecule size. Laboratory studies suggest suppression of cartilage catabolic enzymes (metalloproteinases, aggrecanase) and chondrocyte proteoglycan synthesis stimulation; in vivo clinical significance is doubtful. Large independent RCT GAIT (Clegg 2006, NEJM, 1583 patients) in knee OA showed no significant effect of glucosamine, chondroitin or combination monotherapy vs placebo on pain and WOMAC function. Wandel 2010 network meta-analysis (BMJ, 10 RCTs, 3803 patients) confirmed no clinically significant effect in knee and hip OA.

Safety

Contraindications

Established hypersensitivity to glucosamine, chondroitin or components
Crustacean allergy (for shrimp- and crab-derived glucosamine)
Severe renal or hepatic impairment
Combination with warfarin without INR monitoring (chondroitin may enhance anticoagulation)
Phenylketonuria (some forms contain aspartame)

Serious adverse effects

Enhanced anticoagulation when combined with warfarin with bleeding risk (cases described for chondroitin)
Hypersensitivity reactions in crustacean allergy (anaphylaxis very rare)
Possible glycaemic control worsening in patients with diabetes (data conflicting; monitor HbA1c with prolonged use)

Common adverse effects

Gastrointestinal discomfort, nausea, heartburn
Diarrhoea or constipation
Headache
Somnolence
Skin rash

Uncommon adverse effects

Skin allergic reactions
Headache
Increased warfarin anticoagulant effect

Pregnancy: can you take Glucosamine + Chondroitin?

Safety in pregnancy has not been studied in RCTs. AEMPS Xicil and Condrosulf SmPCs: use in pregnancy is not recommended due to lack of data. There is no therapeutic need for chondroprotectors in pregnancy.

Breastfeeding: can you take Glucosamine + Chondroitin?

Use in breastfeeding is not recommended due to lack of data.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

Practical notes

Timing and administration

Take with food to reduce dyspepsia. The effect (if any) develops over 2–3 months of continuous use. Courses of 3–6 months with possible repetition. Does not have significant drug interactions when combined with NSAIDs, paracetamol, or intra-articular injections.

Dose titration

Glucosamine 1,500 mg daily (split 500 mg three times daily or single 1,500 mg). Chondroitin 1,200 mg daily (split 400 mg three times daily). Combination products typically contain 500 mg glucosamine + 400 mg chondroitin per tablet – 3 tablets daily. Lower doses do not show clinical effects even in positive-result subgroups.

Monitoring

At 3 months, assess clinical effect – pain intensity (VAS), functional indices (WOMAC, KOOS). If no improvement, discontinue – do not repeat the course. In patients on warfarin, monitor INR – cases of increased anticoagulation with glucosamine are reported.

Food and drinks

Dietary sources of glucosamine and chondroitin: bone broths, shellfish cartilage, fish skin, gelatin. Food content is incomparably lower than therapeutic doses – one serving of homemade bone broth contains 100–300 mg of glucosamine versus a 1,500 mg treatment dose. Reaching the therapeutic dose through diet is practically impossible.

Common myths

Myth: “glucosamine and chondroitin restore cartilage”. Fact: direct incorporation into cartilage matrix synthesis is not proven. RCTs assess only clinical effects on pain and function, not structural changes. No conservative intervention “restores” cartilage structure.

Myth: “cheap supplements work the same as Dona”. Fact: the difference between pharmaceutical glucosamine sulphate and over-the-counter glucosamine hydrochloride is substantial. Positive RCTs mainly used the sulphate form at 1,500 mg daily. Hydrochloride in most supplements is a less-studied form with worse results.

Myth: “it doesn't work only because you don't take enough”. Fact: even at the correct dose and form, the effect is clinically minor in the general population. 2019 strongly recommends against. Money spent on chondroprotectors is better invested in physical rehabilitation and, when indicated, joint replacement.

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Frequently asked

What is Glucosamine + Chondroitin used for?

Glucosamine + Chondroitin is evaluated for the following indications with varying evidence strength: Knee osteoarthritis (evidence tier D), Osteoarthritis (evidence tier D), Anti-aging and longevity (evidence tier D). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Glucosamine + Chondroitin?

Common side effects of Glucosamine + Chondroitin (≥ 1 in 100): Gastrointestinal discomfort, nausea, heartburn, Diarrhoea or constipation, Headache, Somnolence, Skin rash. See the Safety section for uncommon and serious reactions.

Is Glucosamine + Chondroitin safe during pregnancy?

Is Glucosamine + Chondroitin compatible with breastfeeding?

Use in breastfeeding is not recommended due to lack of data.

Who should not take Glucosamine + Chondroitin?

Glucosamine + Chondroitin is contraindicated in: Established hypersensitivity to glucosamine, chondroitin or components; Crustacean allergy (for shrimp- and crab-derived glucosamine); Severe renal or hepatic impairment; Combination with warfarin without INR monitoring (chondroitin may enhance anticoagulation); Phenylketonuria (some forms contain aspartame). Full list in the Safety section.

“glucosamine and chondroitin restore cartilage”

direct incorporation into cartilage matrix synthesis is not proven. RCTs assess only clinical effects on pain and function, not structural changes. No conservative intervention “restores” cartilage structure.

“cheap supplements work the same as Dona”

the difference between pharmaceutical glucosamine sulphate and over-the-counter glucosamine hydrochloride is substantial. Positive RCTs mainly used the sulphate form at 1,500 mg daily. Hydrochloride in most supplements is a less-studied form with worse results.

“it doesn't work only because you don't take enough”

even at the correct dose and form, the effect is clinically minor in the general population. ACR 2019 strongly recommends against. Money spent on chondroprotectors is better invested in physical rehabilitation and, when indicated, joint replacement.

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