Ya warm my heart :>)
Tsk, tsk. Naw, I don't know your age (and a gentleman doesn't ask), I just wanted to emphasize that doc's recommendation of glucosamine has had effective restorative (not just preventative) effect even in folks who were presumed to be a bit too advanced in years for effective self-repair. My Ma probably falls into the "late middle-aged" camp, and she could list you a whole range of physical activities which have become easier for her since she started taking glucosamine. Although I'd add that the six-month timeframe mentioned by the_doc is probably realistic, the effects were not immediate.
Of course, your results may vary.