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It is thought that green tea’s antioxidant properties may prevent or reduce the symptoms of osteoarthritis. This claim has not been fully substantiated. One animal study showed that mice given extracts of green tea polyphenols had a lower rate of arthritis than mice which did not receive the extract, and those that did develop arthritis had only mild cases [Pro Natl Acad Sci USA. 1999 Apr 13:96(8):4524].
(Source: Natural Treatments for Fibromyalgia: An A to Z Guide, by Kenna Simmons. An official publication of the Arthritis Foundation. To purchase, visit www.arthritis.org.)