As if the crowded nutrition bar category couldn’t get any more “swol" (that’s bro-speak for pumped-up muscles), nutrition bar brands are exploding with innovative flavors, functional benefits and clean, low-sugar ingredient decks.

Sales stats from Nutrition Business Journal confirm that nutrition bars continue to serve consumer needs. By the end of 2018, nutrition bar sales will fetch a whopping $5.5 billion across all channels; by 2021, that number is expected to rise to $6.8 billion.

What’s driving such impressive growth? Unique products—such as the tasty bars in the following slideshow—are certainly part of the equation.