Glucosamine + Chondroitin

Evidence: ★★★★☆ · Status: OTC Supplement

In plain English

Building blocks and protectors for cartilage. Reduces pain in moderate arthritis over ~8–12 weeks; it's structural, not a painkiller.

How it works

Substrates for cartilage glycosaminoglycans; chondroitin inhibits cartilage-degrading enzymes (aggrecanases/MMPs). Glucosamine sulphate also linked to lower all-cause mortality in cohorts.

Molecular target & official sources

Glucosamine (PubChem CID 439213) · Examine

Protocol

Glucosamine sulphate 1,500 mg + chondroitin 1,200 mg/day.

Bottom line

Meaningful for moderate OA; give it 3 months.

Helps with: Joint Health

The human evidence

The large GAIT trial (~1,500 patients) found glucosamine+chondroitin no better than placebo overall for knee osteoarthritis, though a moderate-to-severe-pain subgroup did benefit. Evidence is genuinely mixed — worth a 6–8 week trial for moderate OA, not a sure thing.

Avoid combining with

Shellfish allergy (most glucosamine is shellfish-derived); mild interaction with warfarin.

Availability & where to buy

Available over the counter. Widely available OTC — e.g. iHerb (ships worldwide); in Singapore also Guardian, Watsons, GNC, Shopee / Lazada. Look for a third-party-tested / GMP mark and check the dose per serving. ~S$20–40/month; give it 6–8 weeks before judging.

Used in these protocols

• Knee Pain
• Knee Pain
• Knee Pain

Compare Glucosamine + Chondroitin

• Glucosamine + Chondroitin vs Omega-3 (EPA/DHA)
• Glucosamine + Chondroitin vs Anastrozole / Exemestane (Aromatase Inhibitors)
• Glucosamine + Chondroitin vs Collagen Peptides (+ Vitamin C)
• Glucosamine + Chondroitin vs Vitamin C (Ascorbate)
• Glucosamine + Chondroitin vs SAM-e (S-Adenosylmethionine)
• Glucosamine + Chondroitin vs Boron
• Glucosamine + Chondroitin vs Glycine