Cocoa Pebbles are gluten-free and an excellent source of vitamin D. So you can feel good about serving a cereal that kids love to eat. Introduced in 1971, Cocoa Pebbles cereal with its delicious chocolatey taste has been a family favorite for over 40 years! Only Pebbles has the fun of Fred Flintstone, Barney Rubble, and the rest of THE FLINTSTONES gang. Post Pebbles is a deliciously fun and wholesome part of a complete breakfast.