Whey protein isolate is much better absorbed so whey protein isolate supplements should absolutely be avoided. Lots of whey proteins are mixtures of whey protein concentrate and whey protein isolates. Labels must be looked at carefully. The only whey protein supplements that are safe to take are supplements that are 100% whey protein concentrate with no added whey protein isolates or hydrolyzed whey proteins. Supplement corporations are geniuses at absorption enhancement, however, enhancing absorption of supplements has very deleterious consequences. Nature apparently held that as nutrients are there in the gastrointestinal system the nutrients should be used and the body became dependent on availability of nutrients in the gastrointestinal system. Any nutrient to be useful has to be available in the gastrointestinal system. Supplement formulations that increase absorption of nutrients have been a disaster.