“Supports joint comfort, flexibility, and mobility.”
Real for a subset of users, oversold for everyone. GAIT (Clegg 2006, PMID 16495392) found glucosamine + chondroitin was NOT significantly better than placebo for knee-OA pain overall, with only an exploratory moderate-to-severe-pain subgroup signal. A responder trial — not a guaranteed joint fix — and that's before the form and dose caveats.

