Subway Keeps Changing Its Chicken Teriyaki on the Sly

Subway's Sweet Onion Chicken Teriyaki sub does very big business. The chain's roughly 27,000 U.S. stores sold more than 84 million of the popular sandwich last year alone, and the item has ranked as a massive seller for more than a decade. “It’s not something you could change the flavor of,” says Subway’s Executive Chef Chris Martone.

But that doesn't mean the vaunted sweet onion sub is immune to change. Many-syllabled artificial flavors have been vanishing from Subway's chicken, with little fanfare from the company and as little notice from regular customers as possible. Subway locations in the U.S. have quietly subtracted disodium guanylate and disodium inosinate—both flavor enhancers that lend foods like Doritos a savoriness—from their chicken marinade in recent months, although the additives remain in certain condiments.

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