Tests found that cartons of milk made by Mengniu Dairy Co., the largest Chinese dairy company, had excessive levels of aflatoxin M1, a substance that can cause liver cancer.
The tests were carried out by the Chinese Administration of Quality Supervision in an inspection of nationwide milk products on Saturday.
The toxin came from contaminated feed consumed by the cows that produced the milk, China's official news agency, Xinhua, reported.
The milk cartons did not make it to market but remained in storage during the inspection, according to a statement from the company on Sunday. Mengniu said that it had destroyed all the toxic milk as it sought to reassure consumers on its commitment to product safety. Read More