Soy Sauce
It was uncovered in 2016 that many soy sauces in China contain a carcinogen called 4-methylimidazole. Manufacturers claimed that the dose was minimal, but because of the daily use, the Hong Kong Consumer Council took things quite seriously.
Tapioca Pearls
Tapioca pearls are another food product to steer clear of in China. Researchers found aspolychlorinated biphenyls in the product, a chemical known to affect the immune system, reproductive system, nervous system, endocrine system, and cause cancer.