DOES CASEIN PROTEIN HELP BUILD MORE MUSCLE? ⬇️ Knowing how to use casein could help you build a little more, so listen closely. In order for your body to build muscle, you need amino acids in your bloodstream, and protein sources like chicken or beef only take about 2-4 hours for the protein to fully digest, with whey isolate being as low as one hour. ✖️ This means your body more than likely won’t have a sufficient amount of protein while you sleep to build muscle. This is where casein protein c