Maximize Muscle Overnight Repair! Aside from getting your fast-absorbing protein immediately after your workout, it's important to get a steady flow of amino acids and protein to those tired muscle tissues long after you leave the gym. What better way to accomplish this task than with micellar casein protein? Casein's time-released formula allows the amino acids and protein to absorb in your stomach slowly, providing hours of repair and maintenance. You can use micellar casein to support long-term muscle building and help keep your muscles happy as you go about your day.* While whey isolate protein is ideal for your post-workout shake, micellar casein protein is the top choice for repair around the clock when you aren't training.