Clif Builder's nutrition aids in muscle recovery by delivering 20 grams of protein to help build muscle mass, with 45% RI of calcium and 23% RI of magnesium per bar to help muscles function, and carbohydrates to help recover depletion of glycogen stores (after highly intensive exercise and/or long-lasting physical exercise).* *Beneficial effect obtained when consuming carbohydrates at a total intake of 4g per kg of body weight within the first 4-6 hours of exercise.