Stark Pharm's Flex GCM formula...
During muscle building, it is very important that the body receives amino acids all the time. As you know, this is not always easy to achieve.
Casein is a slow-digesting milk protein compared to other proteins that digest quickly.
100% Casein Complex is a casein protein that is slowly digested, which provides a steady supply of amino acids to the bloodstream, possibly up to 7-8 hours.