Five companies in northern Vietnam and two in Ho Chi Minh City were raided last week, reported Vietnamese news outlet, Thanh Nien.
The chemicals being used by the companies concerned are said to ensure leaner meat and to give pork and chicken meat a more appealing color.
Such ingredients are banned in food production in Vietnam as they reportedly can be passed on to human consumers and cause cancer in multiple generations.
Vietnam’s agriculture ministry said the regulatory officials involved in the inspections of the companies in question have prevented hundreds of tons of tainted animal feed from entering the market.
Meanwhile, in a separate incident, local media also reported the ministry has recently fined two firms located in Dong Nai Province and in Ho Chi Minh City a total of VND810 million (US$36,000) for using the growth-promotion drug, salbutamol, in feed products.