CFM Whey Protein Isolate is the absolute gold standard among our protein powders. Whey protein isolate is the purest form of whey protein. The abbreviation CFM stands for "cross-flow-microfiltration", i.e. the filtration method used to obtain the highly pure whey protein. With its enormously high protein content of up to 90% (in the tasteless variant), the CFM Whey Protein contributes to the maintenance and building of muscle mass.