If your knees are truly bad, supplements are really not going to change anything. That is a fact, despite the baloney the supplement companies crap. Maybe arthitis, or you have just abused ligaments, tendons or what ever. Surgery may not be the answer either, unless there is a real physical issue, but supplements are more sounds good. That is my experience. I've tried any number and they just don't rejuvenate cartilidge etc. False and a pile of baloney that may actually cause you to have more damage.