Casein is fast becoming the next most popular protein source to whey protein. Casein is derived from milk as well, and it offers a much longer digestion / slower absorption rate compared to its sister-protein, whey. And because of this slow absorption characteristic, casein fits perfectly into the entire muscle recovery jigsaw by taking its place in the sleep recovery process.
When you sleep, that’s when your muscles really build and grow. Consuming casein before sleep will allow your muscles to be constantly supplied with protein throughout the entire sleep process.