The U.S. FDA is reportedly considering a ban on the additive Red 3. Here’s what experts do—and don’t—know about how food dyes affect your health.

The Food and Drug Administration (FDA) has banned the use of Red No. 3, a food dye that had been linked to thyroid cancer in rats over three decades ago. The dye will no longer be allowed in food, drinks, dietary supplements, and oral medications like cough syrups.