Blue 1 (brilliant blue FCF)

Where it lurks: Beverages, candies, baked goods, jellies, condiments

Why to avoid it: A potential mitochondrial toxin that inhibits the body’s ability to convert food into energy. Could increase cancer risk. Linked to increased hyperactivity in children.

Blue 2 (indigotine)

Where it lurks: Pet food, beverages, candies, cereals, ice cream

Why to avoid it: Linked to nausea, vomiting, skin rashes, breathing problems, and increased hyperactivity in children.