The protein bar that works as hard as you do. You're not done. You're a work in progress, building toward something big. I know the feeling. That's why we made Clif Builder's - the only protein bar that makes every ingredient count, to help sustain your energy and rebuild your muscles effectively. Other bars have fillers and unusable ingredients like sugar alcohols. Not us. We've ensured every ingredient in Clif Builder's serves a purpose, so it can best serve you. After all, you're working toward something. We just want to do all we can to help you get there. - Gary, founder and owner of Clif Bar & Company. We source ingredients that are not genetically engineered. 35% organic ingredients. Low glycemic. Low glycemic foods digest slowly for prolonged levels of satiation and energy.