2008 Chinese baby formula disaster
https://www.youtube.com/watch?v=xtTey7-3Zuk
https://qz.com/1323471/ten-years-after-chinas-melamine-laced-infant-milk-tragedy-deep-distrust-remains/
China declared a national food-safety emergency (link in Chinese), that Zhang found out the culprit was a chemical compound called melamine, used in plastic and fertilizer production, that had made its way into baby formula.
The incident shattered the confidence of people in Chinese-made infant formula—and in the entire local food supply. Ten years later, the deep distrust remains, in spite of the government making concerted efforts over the years to make infant formula among the most heavily regulated (link in Chinese) foods in China.