20g protein for muscle maintenance 20 of your recommended daily intake of vitamin d 854 mg of magnesium100 batch tested and informed sport accredited maximuscle promax bars are a high protein bar to support muscle maintenance and development plus they also have added vitamin d magnesium promax bars offer a convenient snack alternative that contains 20 g protein in every great tasting bar the newly formulated maximuscle promax bars have been nutritionally tailored to meet you