Whey isolate protein is a type of dietary supplement that is derived from milk. It is a highly refined and concentrated form of whey protein, containing up to 90% or more protein, with minimal amounts of fat, lactose, and other impurities. Whey isolate protein is made by filtering the liquid whey from milk multiple times, which removes most of the non-protein components. This results in a fast-absorbing protein source that is easily digestible and ideal for promoting muscle recovery and growth.