Our flagship protein is made with 100% super pure serum isolate, fast acting serum hydrolysate and virtually nothing else. The result is an industry-leading percentage of protein purity (PPP) of up to 87%. ^ R1 Protein is protein with a capital P. How to use it: It really depends on factors such as your physical size, what your diet consists of, how many total calories you eat and your activity level. A common rule of thumb in the bodybuilding world is to aim for 1 gram of protein per pound of body volume per day. In other words, a 200 lb athlete should aim for 200g of total protein from all dietary sources, including protein powders and other supplements.