Science in sport whey protein vanilla 1000g sis whey protein contains a blend of high quality whey protein isolate and concentrate the product formulation provides a source of rapidly digesting protein with an amino acid profile which supports lean muscle growth and maintenance with at least 5g of bcaas per serving each serving contains 22 23g of protein per serving depending on the flavour you choose whey protein has some of the highest digestion rates known and has a high leucine content