glucosamine chondroitin

I am wanting more information on glucosamine chondroitin and WLS. I do not have arthritis but have a really bad crunching sound in my knee (no pain) My PCP recommended taking this. If glucosamine has sugar in it and I haven't eaten sugar in three months (like I use to anyway)could the weak cartilage be due to a sugar deficiency? Can the glucose in this vitamin make you dump? My PCP said she has another WLS patient with the same issue. Coincidence?Thanks for any information.

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