Rule1 R1 Protein Rule1 R1 Protein moto is to tell you about the quality of its products, i.e. ‘better input=better output’. So it is clear that their priority is to place premium quality products. Rule 1 is also considered to be the front runner, by the popular brand Optimum Nutrition. The formula is 90% + dual protein, made with 100% pure whey isolate and fast-acting whey hydrol