Supermarket chains Kroger Co. and Stop & Shop said Thursday they will join the growing list of store chains that will no longer sell beef that includes an additive with the unappetizing moniker "pink slime."

Federal regulators say the ammonia-treated filler, known in the industry as "lean, finely textured beef," meets food safety standards. But critics say the product could be unsafe and is an unappetizing example of industrialized food production.