The Food and Drug Administration is investigating claims from over 100 people that Lucky Charms breakfast cereal made them sick.

The agency, in a statement to AP, said it “takes seriously any reports of possible adulteration of a food that may also cause illnesses or injury.”

General Mills, which makes the popular cereal, said it was aware of the reports and takes them seriously, but said it has not found any evidence linking Lucky Charms to consumer illness.

A website where people self-report illnesses they feel are food-related has several hundred more complaints, listing symptoms including nausea, vomiting, diarrhea, and stomach pain, but those reports cannot be verified.

General Mills is encouraging people who feel they might have gotten ill after eating the cereal to contact the company directly.

To date, no recall has been issued for Lucky Charms.

Cereal recalls do happen, but they’re rare, since the cereal itself is usually cooked before it’s packaged. The last notable recalls for the category were in 2020, when Kellogg’s recalled certain packages of Honey Smacks cereal for salmonella risks and Quaker Oats recalled select Cap’n Crunch’s Peanut Butter Crunch for the same reason.