After ingesting a food containing propylene glycol, about 45% of it will be excreted by the kidneys unchanged. The rest is broken down in the body into lactic acid.

Propylene glycol appears in many processed foods, and the U.S. Food and Drug Administration considers any product with below 50 grams of propylene glycol per kilogram to be safe.

A Texas law promoting the Trump administration’s “Make America Healthy Again” agenda requires first-ever warning labels on ...