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Chicago Tribune
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Chromium picolinate, a dietary supplement popular among fitness buffs and people trying to lose weight, has been shown in tests done on cells grown in the laboratory to cause severe damage to chromosomes.

Although no animal studies of the supplement’s cancer-causing potential have yet been done, the genetic changes observed in the laboratory suggest that this widely sold supplement could be carcinogenic, according to researchers at Dartmouth College and George Washington University Medical Center.