BOSTON — The Whole Grain Stamp has achieved a new milestone in that it’s now found on more than 4,000 products, according to the Whole Grains Council.

“Before we introduced the Whole Grain Stamp in 2005, consumers found it really challenging to find significant sources of whole grain in their favorite products,” said Kara Berrini, program manager for the Whole Grains Council. “The stamp is a straight-forward tool that anyone can use, and because it has encouraged so many companies to produce such a wide variety of whole grain products, it’s easier than ever for people to find and enjoy more whole grain options.”

The Whole Grain Stamp is now found on products in 21 countries. McDonald’s and Burger King now offer whole grain buns with their chicken sandwiches.