Consumer-rights law firm Hagens Berman has filed a class-action lawsuit against some of the country’s largest retailers alleging major fraud in the $6 billion per year herbal supplement market. The suit was filed on behalf of consumers who purchased supplements from GNC, Target, Walgreens and Walmart that have been found to contain no traces of purported healthful ingredients listed on the supplements’ labels, and in some cases other ingredients not disclosed on the packaging.

“We believe these major retailers have completely abandoned their responsibility to consumers who trust that their products contain what’s listed on the label—not phony pills full of anything but,” said Steve Berman, managing partner at Hagens Berman and attorney representing the class of purchasers. “Millions of consumers across the nation have been duped by GNC, Target, Walmart and Walgreens and have spent years purchasing fake and fraudulent products.”

The 61-page lawsuit filed in the U.S. District Court for the Northern District of Illinois cites GNC, Target, Walgreens and Walmart for “selling certain store brand Herbal Supplements that fail to contain the ingredients that the Defendants represent are contained in the Herbal Supplements, or, that contain other substances which are not disclosed on the packaging for those Herbal Supplements.”