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IT'S ESTIMATED THAT 2 OUT OF 3 AMERICANS TAKE SOME KIND OF COMPLEMENTARY OR ALTERNATIVE MEDICINE* -- LIKE HERBS OR VITAMINS. BUT RESEARCHERS ARE ISSUING A WARNING TO CANCER PATIENTS WHO TAKE THEM. AS CLARK POWELL SHOWS US, SOME POPULAR SUPPLEMENTS CAN INTERFERE WITH CANCER TREATMENTS AND IN SOME CASES MAKE THE DISEASE WORSE.