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"There are two main types of magnets: static or permanent magnets generate the magnetic field by the spin of electrons within the material itself, and electromagnets generate a magnetic field when an electric current is applied. Most magnets sold for health purposes are static magnets of various strengths. They have been incorporated into arm and leg wraps, mattress pads, necklaces, shoe inserts and bracelets, and are marketed with claims of effectiveness for reducing pain of various origins. It has been suggested that about 28% of patients with rheumatoid arthritis, osteoarthritis or fibromyalgia use magnets or copper bracelets for pain relief. Our aim was to assess the clinical evidence from RCTs of static magnets for treating pain…..Overall, the data suggested no significant effects of static magnets for pain relief relative to non-magnetic placebo." Max H Pittler, Focus on Alternative and Complementary Therapies [FACT] (March 2008) [The article is accompanied by a table of trials included in the meta-analyses.]