VPLab Casein & Whey provides a dynamic blend of whey protein and micellar casein that works throughout workout and during the recovery phase at night. Whey protein has the highest biological value of any protein, which refers to a protein that has all the necessary essential amino acids for protein biosynthesis and is fast-acting to support amino acid replenishment required during and after strenuous activities. Plus, this revolutionary protein formula includes extended-action micellar casein that works well beyond strenuous activities to continually rebuild broken down muscle.