SupplementModerate evidenceEnergy

Glucosamine + chondroitin sulfate

Cartilage building blocks with patchy but real RCT signal for moderate-to-severe knee osteoarthritis pain.

Why

Glucosamine sulfate and chondroitin sulfate are endogenous components of joint cartilage. The evidence has been notoriously inconsistent: early industry-sponsored trials were positive, the large independent GAIT trial was null overall, and subgroup analysis suggested benefit only in moderate-to-severe knee pain. The MOVES head-to-head trial later showed non-inferiority of the combination vs celecoxib over 6 months.

How it works

Substrate provision for glycosaminoglycan synthesis in articular cartilage; modest anti-inflammatory effects on chondrocyte NF-κB signalling. Chondroitin may also inhibit cartilage-degrading enzymes (MMP-3, MMP-13).

Expected onset · Symptomatic effect typically over 4–8 weeks; structural effects on joint-space narrowing emerge over years if at all

How to take

Dosage

Glucosamine sulfate 1,500 mg/day (preferably as a single daily dose, the EU-licensed form) + chondroitin sulfate 800–1,200 mg/day.

Timing

Once daily, with food

On the label

Look for pharmaceutical-grade 'glucosamine sulfate' (the EU-licensed form), not glucosamine hydrochloride, and chondroitin from bovine or porcine tracheal cartilage, not shark cartilage.

Ideal for

Adults with moderate-to-severe knee osteoarthritis pain, the subgroup where benefit appears more consistent.

Safety

Glucosamine is derived from shellfish in most products; check label if allergic. May modestly raise INR with warfarin. Theoretical effect on glucose tolerance was not borne out in long-term RCTs but worth monitoring in diabetes. Glucosamine hydrochloride is not equivalent to glucosamine sulfate; most positive trials used the sulfate form.

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Evidence

At a glance

Clegg 2006 NEJM GAIT trial (n=1,583): overall null result for the full cohort, but the prespecified moderate-to-severe pain subgroup showed significant benefit on the combination vs placebo. Hochberg 2016 Ann Rheum Dis MOVES (n=606): glucosamine sulfate + chondroitin sulfate non-inferior to celecoxib for WOMAC pain reduction over 6 months. Effect size modest; product quality matters.

Where to get it

Shop Glucosamine + chondroitin sulfate on Amazon

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