I play volleyball and I have been struggling with both knee and shoulder pain for years, until I discovered the Cissus quadrangularis extracts. I initially started taking CissusRX from USPLabs but stopped - the pain returned after a few weeks/games. Then I sourced to a cheaper version of Cissus from Primaforce, which works just as well and lasts longer. The taste takes a little time to get used to and it has perhaps a bit liquerishy taste. But aside to that, the stuff works really well. It has anti inflammatory properties and also helps with bone health. I can say with confidence that this is the real deal.