I had first taken SierraSil a few years ago for knee and leg aches especially when hiking in hilly areas. I had stopped taking it but shortly after went on a major hiking trip which I completed without the slightest bit of discomfort. Last fall, I again was having aches in my hip and leg to the point that I could not lay on my left side and was going up stairs with my right leg only. I decided to give SierraSil another try. The first 3 or 4 weeks passed with little change but by the end of the first bottle of 180 capsules (2 months) I did notice some improvement. About the 3 month mark, I realized that the aches and discomfort in my hip, leg and knee was virtually gone. I have no hesitation in recommending SierraSil.