What is Rule 1 Whey Blend? Rule 1 Whey Blend is a high-quality whey protein blend from Rule 1. This is the same people behind Optimum Nutrition so you know the quality and flavours are going to be amazing. This is a blend of whey protein concentrate and whey protein isolate which provides a product very high in protein and quite low in carbohydrates and fat. Whey protein is the king when it comes to muscle growth and recovery. It is naturally high in branched-chain amino acids which signal muscle protein synthesis and provide the fuel you need to recover from hard training. Rule 1 Whey Blend also utilises whey protein concentrate which has a very high biological value. Along with being slightly slower to sustain your body for longer, it is also excellent for your immune system keeping you fit and healthy while training hard. The best times to utilise whey protein like this one are first thing in the morning and again immediately post-workout. Whey Blend mixes instantly and tastes amazing so you'll look forward to every shake.