What is the new protein fuel 50 a fantastic ready to drink shake our popular usn protein fuel 50 is a great addition to the core series formulated to provide you with the same benefits as one of our powerful shakes our ready to drink supplement is convenient and available in a variety of great flavours provided in packs of 8 each of our 550ml bottles provides you with up to 50g of premium protein and our new formulation contains less carbs and lower fats what are the benefits its widely