After a Miniskusverletzung and cruciate ligament I have always had problems with my knee. On the advice of various doctors and physical therapists I have tried different products which should help the cartilage or synovial fluid to improve or not to allow even wear schnelelr. I am so far quite well to peace with it, especially since I do competitive sports and the knee is subjected to correspondingly high loads. So far I have not felt neg. Impact. The positive effects (not much knarksen knee) can not be unequivocally attributed to the product but it feels good. And at the price it is very reasonable compared.