because it's a pleasant superstition that has a placebo effect.
For fashion and some people think it actually works for pain, but i believe all metals or whatever release toxins through your skin.
Well i have seen loads of people wearing copper for their arthuritis so i presume it works or why would they wear them.
Never heard of bronze worn for health, magnets and copper<br />
Many of the websites that sell copper jewelry tout its health benefits, particularly regarding arthritis, but very few provide references for their claims, much less present opposing viewpoints. Therefore, I conducted a series of literature searches for information about health benefits and risks of copper. Some of my references seem fairly one-side concerning the health impact of copper (copper associations, jewelry designers), but others present both positive and negative effects (WebMD, Wisconsin Department of Natural Resources, Agency for Toxic Substances and Disease Registry). I have listed books that discuss the effects of copper on health, located just below the Internet references, with links to Amazon for further information. The bottom line: Copper is essential for good health, so if you are deficient in copper (e.g., taking high doses of vitamin C or zinc or have a diet lacking copper-containing foods), wearing copper jewelry may offer health benefits (bones, joints, circulatory system, nervous system). Unless you have a rare metabolic disorder or are exposed to high levels of copper (have copper plumbing or live near a copper mine or foundry), wearing copper jewelry is unlikely to cause harm. Although your body is good at blocking too-high levels of copper, intentionally ingesting high doses of copper can have serious health consequences.