The glucosamine worked for my Dad. Then he read somewhere about Equal causing joint pain. He laid off the glucosamine and kept his regular 1 packet of Equal/ day with Coffee. Joint pain, especially knee, came back. He laid off the Equal and all pain gone. It took about a week to get out of his system completely.
It worked for him. I say if you're using any artificial sweeteners or diet sodas too, at least give a personal experiment like that a shot.
I'm not knocking glucosamine, but something else might be working against you.

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85' 300D No inspection, No registration fees, Cheap insurance
"If my calculations are correct, when this baby hits 88 miles per hour, you're going to see some serious %$&^."