Herself had a bad fall last winter, which seems to have induced rheumatoid arthritis. It was particularly severe in the hands, especially the right one. She got a plain copper bracelet, not magnetic. We noticed that, at first, heavy deposits of verdigris accumulated on the inside of it, and needed regular cleaning off. After a while, these deposits lessened, until they stopped altogether. This suggested to me that there was some interaction between the bracelet and the skin, which altered over time. I bought her another plain copper bracelet for the left wrist. Same story. Heavy deposits of green at first, gradually diminishing. And the first bracelet did seem to have a beneficial effect, although this could just be coincidence. One note of caution, though. The second bracelet, from a well-known pharmacy chain, was lacquered on the inside. I had to clean this off before it would cut down with polish. How it was supposed to have any effect with a lacquered inner surface, I don't know.