High quality protein nourishes working muscles, allowing them to make bigger gains. Proteins break down into amino acids, which the body uses to help rebuild & grow muscle fibres. Progain bars give your body the calories & more importantly the high quality protein it needs to increase muscle mass & size. We also include creatine to help aid your performance during short duration, high-intensity exercise. Each bar contains 24g of high quality protein for muscle gain. Each bar contains 3g creatine to aid your high-intensity performance with this scientifically proven ingredient.