The official 50th birthday of PEBBLES cereal may not be until later this year, but that hasn't stopped the brand from divvying out the gifts early. Following the recent news of the new Birthday Cake cereal flavor, a (very colorful!) merch drop with Love Your Melon, and a number of other tasty collaborations delivered last year, PEBBLES is now joining forces with leading hydrolyzed whey protein isolate brand Dymatize for a yabba dabba do-licious version of the Birthday Cake PEBBLES that you'll want to pick up ASAP. This isn't the first time Dymatize has collaborated with the PEBBLES brand though. Last year, they launched the now fan-favorite Fruity and Cocoa PEBBLES-flavored protein powder in honor of the legendary brand's upcoming birthday.