Cant trust your supplier.

http://www.msnbc.msn.com/id/18027830/
Karuna Chondroitin Sulfate, which claims “the optimum in purity, potency and reliability,” contained only half the labeled chondroitin.
Nature’s Plus Ultra Maximum Strength Chondroitin 600 had no detectable chondroitin.
Swanson Health Products’ Premium Brand Glucosamine & Chondroitin had only 8 percent of promised chondroitin.
Weil Glucosamine & Chondroitin contained the claimed ingredients but they didn’t break down quickly enough. That’s a problem, Cooperman says, because it will result in the supplement just passing through a person’s body without being absorbed.What a bunch of theves.