Which of the following CAM therapies has been demonstrated as effective in the treatment of rheumatoid arthritis?

Question

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Gamma-linolenic acid is an omega-6 fatty acid found in the oils of borage and primrose oil that can be converted to the antiinflammatory PGE-1.Copper bracelets have been suggested to allow for absorption of copper through the skin, but no studies have substantiated this.Echinacea therapy is among a number of CAM therapies that the Arthritis Foundation recommends that people with rheumatoid arthritis should not use.Thunder god vine has been used in China to treat patients with a number of autoimmune disorders, but no consistent, high-quality vine preparations are available in the United States.

Which of the Following CAM Therapies Has Been Demonstrated as Effective