Not sure how Xylitol is being marketed. It is an alcohol found in a lot of plants, including birch wood, which is the source of Xylitol used in medicines. And it is toxic to dogs, even in small amounts. Most of the time you find it in sugarless gum and candy.
Here is an FDA warning "Paws Off Xylitol": https://www.fda.gov/consumers/consumer-updates/paws-xylitol-its-dangerous-dogs