I just read the results of a couple of new studies last week on glucosamine and chondroitin for knee OA. The results were mixed, but not very positive. My rheumatologist says it helps 50% of those who take it, but takes several weeks to show results. I have been taking it for several years--- just in case it is helping me. I'd hate to stop taking it, feel worse, then have to wait for weeks for it to start helping again!
Of all the options--- it seems pretty benign and worth continuing....