M&M’s in Europe look and taste about the same as those sold in the U.S. But stateside, the candy comes with one key difference – and it may be harmful to your health.

Some M&M’s made for European consumers use radish, lemon and cabbage extracts for coloring to make them catch shoppers’ attention, instead of synthetic food dyes.

Consumers in the U.S. are asking for foods without synthetic dyes, according to Mars, which manufactures M&M’s. But products like that are harder to come by in this country: Those same M&M’s are coated with synthetic dyes like Red Dye No.

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