Question: how long does it take to see the results of whey protein?
Answer: Results. It turns out that when participants drank whey alone, it took 4 hours to reach maximum total serum amino acids levels, which increased about 30% from baseline (from 1.71mg/L to 2.22mg/L). So, with straight unadulterated whey you get a 30% increase in total amino acid levels after 4 hours.