The food maker recalled Apple Jacks, Corn Pops, Froot Loops and Honey Smacks after about 20 people complained. Five reported nausea and vomiting.
The company says it has identified chemicals normally present in packaging called hydrocarbons as the source.
The Food and Drug Administration said it is reviewing Kellogg's information and conducting its own risk assessment.
Kellogg Co. is based in Battle Creek, Mich.
