The U.S. Food and Drug Administration is taking issue with claims that Cheerios cereal can lower cholesterol.

In a letter to General Mills, the FDA says that statements made on Cheerios packaging like the claim that the cereal is “clinically proven to help lower cholesterol” make the product a drug under federal law. The agency suggests that General Mills should file a new drug application with the FDA if it wants to keep making these claims on Cheerios boxes. The FDA also noted concerns with statements made on a General Mills-sponsored website regarding the benefits of eating whole grains.

The Wall Street Journal is reporting that a General Mills spokesperson said the company will work with the FDA to reach a resolution regarding Cheerios labeling.