U.S. dietary supplements often contaminated - report

WASHINGTON (Reuters) - Many popular dietary supplements contain ingredients that may cause cancer, heart problems, liver or kidney damage, but U.S. stores sell them anyway and Americans spend millions on them, according to Consumer Reports.

The consumer magazine published a report on Tuesday highlighting the U.S. Food and Drug Administration's lack of power to regulate such supplements, and said the agency rarely uses what little power it does have.