So you've used it for years? I probably stayed with it a couple months each time, maybe...it's pricey and not knowing HOW LONG to stick with it...makes one stop if not feeling any results. I guess. I'm back on glucosamine, I had taken it off and on for years but this time I'm staying with it. Talking about how long to stay with "something", my grape seed ex is a true testiment to this theory....20 yrs soon. But I did get positive results in a week or so in the beginning which told me something...stay with it!