It was recommended to me after the ortho here saw my last MRI results, lol.. I take it and it works to relieve knee pain from my osteoarthritis and meniscus injuries. Studies have shown pain relief compared to that of NSAID's which I can't take. I believe it. It does take a couple of weeks to notice the improvement.

As CarbonFiberBoy said, it's important to take Glucosamine Sulfate, not the Glocosamine HCl that used to be popular as an herbal supplement combined with Chondroitin. That never worked for me and in fact no studies show any benefit.

The Glucosamine Sulfate I take here in SE Asia is called Viatril, and comes in a 1500mg sachet, to be added to water. Good stuff. I take one packet every day.