I had been taking Trader Joe's Joint Support with glucosamine sulfate, MSM, and chondroitin sulfate for elbow tendonitis. It definitely helps. I had planned to switch to a Costco product I bought that has higher doses of glucosamine sulfate and MSM, but unfortunately it does not have chondroitin. I need something that will also help rebuild Cartilage in my feet. The Costco Kirkland bottle says: for optimum joint health and helps support cartilage. Which supplement helps the body to rebuild Cartilage? I found info on that on the internet to be unclear. thanks!!!!!!!!!