Yes. Whey enters the blood stream very fast, but also leaves very fast. That is the reason that I think a protein combination such as that made by Met-RX metamyosin is superior to whey. Alternatively you can build you own forumla on proteinfactory. A combination of Whey Isolate, Calcium Casienate, Egg protein, Milk Protein Isolate and glutamine peptides will give the best of both worlds: Fast absorption for very high amino level concentrations along with slow absorption for sustained lower levels of aminos in the bloodstream for even 3 hours. Whey byiself is over hyped, most bros just take a protein shake after workout and think they are done with 'good' protein, then they wait 2 hours for next meal which is also bad, as Mr.X noted, aminos from whey are out very fast, you're left with hours of catabolism.