Do people take joint supplements? And what kind if so?

I have been taking the osteobiflex glucosamine and chondroitin advanced triple strength (as recommended by my orthopedist) since April when diagnosed with runner's knee.  There are those on BT that will say you might as well take a placebo because it is just as effective and cheaper but I do think it is helping me, heck it isn't hurting me.

Hope it helps your knees.

after every workout I take antioxidants (lycopene from tomatoes, grape seed extract, astraxanthin) and low molecular weight hyaluronic acid (injuv).

so far working great. 

http://www.thenaturalhealingplace.com/chondroflx.html

I have been using this brand for years.  My husband started using it for his back and has been  pain free since then.  Some might say rubbish, but it is good prevention IMO.

I've been on Cosamin DS for about 4 years now, and I'm confident it's helping because last summer I had to stop taking all OTC medications for a couple weeks before an unrelated surgery.  During that time, my knees became distinctly more painful and achy.  I suffer from arthritis and chondromalacia patella in both knees.  So, my knee problems are cartilage-related.  Check with your doctor to see if he/she thinks a joint supplement will help.  They are expensive and probably a waste of money if you have knee problem unrelated to cartilage.