What is a blue raspberry? Has anyone ever seen one growing on a vine? Despite its popularity as a flavor in soda, ice pops and slushies, you won’t find them in your garden or at the local orchard. Blue raspberry is not a fruit.Instead, it’s a sweet and tangy flavor with a taste that nature couldn’t create – but should have. Today that distinctive taste is available in all sorts of products, including Blue Raspberry-flavored 5-Hour ENERGY® Extra Strength shots.