Designed by athletes for athletes CLIF BLOKS energy chews are a delicious source of quick carbs to provide fast fuel during long runs races games and other high-intensity workouts. Our bite-sized energy chews come 33-calorie cubes in a variety of sodium and caffeine* levels to help you customize your experience all in an easy-to-carry and easy-to-open package. CLIF BLOKS are also non-GMO with no high-fructose corn syrup or artificial flavors. *Caffeine can range between 60-70 mg. Not recommended for pregnant or nursing women children under 18 years old or people sensitive to caffeine.