A federal judge on Monday tentatively denied certification of a consumer class action alleging that the “100 Percent Natural” labels on Wesson cooking oils are misleading because the products contain seeds from genetically modified plants.

U.S. District Judge Margaret Morrow raised concerns during a hearing about certain claims against ConAgra Foods Inc., which makes Wesson oils, but gave plaintiffs an opportunity to amend their certification motion, according to Adam Levitt, a director at Grant & Eisenhofer’s Chicago office.