I'm on my feet at work all day and after a couple of hours my left knee would be so painful. I could hardly bend it. After using Copper Fit for only one day my pain was almost gone. I have used several other knee braces and supports, non containing copper but were made of sturdier materials, and they did little to take away my pain.
I don't know why this product works, but for me it is GREAT.
Bottom Line: Yes, I would recommend this to a friend