More than 1,400 vitamins and supplements from 152 brands have now undergone testing, CVS says.
The testing is performed by independent inspectors — not by CVS or the supplement makers themselves. It checks for contaminants and verifies that the contents listed on the labels are correct.
CVS says 7% of the products flunked, and were either pulled from the shelves or had to change their labels.
Research by Cohen and others has found that many supplements contain unlisted ingredients and sometimes even dangerous drugs. The CDC estimates that supplements result in 23,000 emergency room visits in the U.S. every year.