20 g Protein Bar Kosher Low Glycemic† Non-GMO Ingredient Sources The Official Protein Bar of Spartan Race - You'll Know at the Finish Line Fitness is Built You're not done. You're a work in progress, building toward something great. That's why we made Clif Builder's — the great-tasting protein bar that makes every ingredient count — so you can get the most out of your workout. 20 g of complete protein, with essential amino acids to help repair and build muscle. Carbohydrates to help replenish your muscle glycogen stores after a workout. Vitamins and minerals to support protein metabolism.