While it’s known for affordability and convenience, many menu items contain ingredients that nutritionists and health experts warn can be harmful when consumed regularly. From artificial preservatives ...

Propylene glycol (C₃H₈O₂) and ethylene glycol (C₂H₆O₂) differ by one carbon and two hydrogen atoms. Ingesting a relatively small dose of EG can be very harmful because the liver converts it into toxic ...

The WHO's working theory is that in 2021, when prices of propylene glycol spiked, one or more suppliers mixed the cheaper toxic liquids with the legitimate chemical, Kuwana said.

Plenty of antifreeze brands use propylene glycol as a safer replacement for ethylene glycol, which is much more toxic and entirely unsafe to consume.

He said the chemical propylene glycol, which is one of the ingredients in Beneful, caused two of his three dogs to die after he fed them then food.

"Marion bought commercial-grade propylene glycol," said a second source, an investigator, who declined to be named while the inquiry is ongoing.