I tried the copper bracelet for over a year with no effect other than a green wrist. I have also tried the magnetic one and found that it made me feel ill. I thought it may have been a coincidence but a few days after I took it off I was feelng O.K. again so I gave up on that.
I did, and still wear it with no ill effect. I injured my wrist 18 years ago, and was told to expect arthritis as I got older, I'm now 43, wrist is still painful at times, but it does seem to have helped, and the twisted type I have looks good, lol!.
Had one some years ago when my doctor diagnosed chronic arthritis. I'm sure he'd just learned the word chronic, because any arthriris sufferer will tell you the pain is chronic. I got a copper bracelet and it was as useful as anash tray on a motorcycle.