ISOFLEX: 100% Püre Whey Protein Isolate Powder uses a unique protein extraction technology called Hybrid-Ratio Ion-Filtration (HRI). A hybrid of two isolate purification technologies incorporated at a specific ratio to produce a truly superior ultra-pure Whey Protein Isolate powder. Cutting-Edge HRI Technology allows ISOFLEX to retain an exceptionally high protein yield while maintaining enhanced bioactive whey fractions. This process is one of the reasons Isoflex is considered by many to be the best whey protein isolate on the market today.