Maybe you are thinking of the contaminated L-tryptophan which happened in 1989. But that was a Japan-based lab. From the FDA [0]: > FDA issues a nationwide re

Maybe you are thinking of the contaminated L-tryptophan which happened in 1989. But that was a Japan-based lab. From the FDA [0]: > FDA issues a nationwide recall of all over-the-counter dietary supplements containing 100 milligrams or more of L-Tryptophan, due to a clear link between the consumption of L-tryptophan tablets and its association with a U.S. outbreak of Eosinophilia Myalgia Syndrome (EMS), characterized by fatigue, shortness of breath, and other symptoms. By 1990 the Centers for Disease Control and Prevention confirm over 1,500 cases of EMS, including 38 deaths, and FDA prohibits the importation of l-tryptophan. I’m having a hard time finding a good article/document to link to but apparently the lab (Showa Denko) destroyed production report and reconfigured the production line to hide what happened. They were apparently using a new method to create L-Tryptophan and it had a flaw. This seems to fit your comment except for the Australia part. I can find other articles about a large Australian vitamin recall, but it’s not related. [1] [0] https://www.fda.gov/about-fda/fda-history/milestones-us-food-and-drug-law https://www.fda.gov/about-fda/fda-history/milestones-us-food... [1] https://pmc.ncbi.nlm.nih.gov/articles/PMC1125922/ https://pmc.ncbi.nlm.nih.gov/articles/PMC1125922/