Healthnews24South Africa's supplement answer desk

Do glucosamine and chondroitin work?

Healthnews24 editorial deskUpdated 2 min read
Answer first

Glucosamine and chondroitin have mixed evidence for osteoarthritis. A 2015 Cochrane review found chondroitin gave only slight short-term pain relief, with better-quality trials showing little or no benefit, and major guidelines do not recommend them routinely. Typical doses are 1 500 mg glucosamine and 1 200 mg chondroitin daily; check shellfish allergy and warfarin first.

  • A 2015 Cochrane review (Singh et al.) found chondroitin gave only slight short-term pain relief, with better-quality trials showing little or no benefit.
  • Typical trial doses are about 1 500 mg glucosamine and 1 200 mg chondroitin a day.
  • Most glucosamine is shellfish-derived; check labels if you have a shellfish allergy.
  • Glucosamine, with or without chondroitin, has been linked to raised INR in people taking warfarin.
  • Treat any trial as time-limited: stop after about three months if there is no clear benefit.

Do glucosamine and chondroitin work?

For most people, the benefit is small or absent. Glucosamine and chondroitin are building blocks of cartilage, which is why they are popular for osteoarthritis. Whether swallowing them helps joints is another matter. The 2015 Cochrane review of chondroitin (Singh and colleagues) found that it gave slight pain relief compared with placebo in short-term trials, but the better-designed studies showed little or no benefit, and the effect on cartilage loss was unclear. For glucosamine, Cochrane's earlier review found benefit with one particular glucosamine sulfate preparation but not with others, and later trials without industry funding were less positive. Major rheumatology guidelines generally advise against routine use, or give only weak support. Our evidence rating is weak to mixed.

Who might try them?

Some people with mild to moderate knee osteoarthritis report feeling better and wish to try them. If you do, treat it as a time-limited trial:

  1. Agree it with your doctor first.
  2. Use one product at the usual trial dose: about 1 500 mg glucosamine and 1 200 mg chondroitin a day.
  3. Track pain and function on a simple 0–10 scale.
  4. Stop after about three months if you see no clear benefit.

Because they are slow-acting at best, they do not help acute flare-ups.

What has better support for arthritis?

  • Exercise, including strengthening and walking programmes.
  • Weight loss if you are overweight, which reduces load on knees and hips.
  • Physiotherapy or biokinetics, and pain relief your doctor recommends.
  • Joint injections or surgery where indicated.

Collagen is another popular option with emerging, mixed evidence; see collagen for joints over 50 and does collagen help joints and tendons.

What are the safety points?

  • Shellfish allergy: most glucosamine is made from shellfish shells; some products use fermented corn. Check the label.
  • Warfarin: reports link glucosamine, with or without chondroitin, to raised INR. Tell your doctor and monitor.
  • Diabetes: older concerns about blood sugar are not firmly supported, but monitor glucose and speak to your doctor.
  • Pregnancy and breastfeeding, under-18s, kidney disease: not enough safety data; ask your doctor.
  • Quality: content varies between products, and unregistered complementary medicines carry a SAHPRA disclaimer.

See supplement-drug interactions for older adults.

What do they cost in South Africa?

We did not capture glucosamine or chondroitin products in our price research for October 2026, so we cannot quote Rand prices. Compare cost per daily dose rather than per bottle, and make sure the label states mg per capsule. Joint supplements often combine many ingredients (MSM, turmeric, collagen); a "joint formula" with small amounts of each is poor value.

When should you see a doctor?

See a doctor for hot, swollen joints, morning stiffness lasting over 30 minutes, night pain, or sudden loss of movement, which can signal inflammatory arthritis or other problems. Do not rely on supplements instead of diagnosis. This is general information, not personal medical advice.

Sources

  1. Singh JA et al. (2015) Chondroitin for osteoarthritis. Cochrane Database Syst Rev CD005614
  2. NutraIngredients (Feb 2015): Cochrane review on chondroitin's efficacy for osteoarthritis

Educational information only, not medical advice. Speak to a doctor, pharmacist or registered dietitian before using supplements if you are pregnant or breastfeeding, under 18, taking medication, or living with kidney, liver or heart disease.

Cite this page: Healthnews24, “Do glucosamine and chondroitin work?”, updated 27 October 2026, https://www.healthnews24.co.za/answers/glucosamine-and-chondroitin-for-arthritis/. Plain-text version: /answers/glucosamine-and-chondroitin-for-arthritis.md