Following years of reformulating at McDonalds, most of the burgers it serves in the U.S. are now preservative-free.

As of Wednesday, the worlds largest burger chain says classics like the Big Mac and Quarter Pounder with Cheese are preservative-free, with reformulated buns and sauces. Pickles on the sandwiches still contain artificial preservatives, but customers can request sandwiches without pickles.

McDonalds has been gradually removing preservatives from its menu for several years in an effort to appeal to more health-conscious buyers. In 2016, it removed high-fructose corn syrup from its buns and took artificial preservatives out of its Chicken McNuggets.

The Chicago-based company says around one-third of its sandwiches still have artificial colors, flavors or preservatives, including Egg McMuffins and Filet-O-Fish. It hasnt set a timeline for removing those ingredients.

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