No Protein Spiking No Proprietary Blends No Inferior Caseinate Not Made With Gluten or GMO's No Banned Substances No Proprietary Blends Fully Transparent Since 1996 Manufactured in Our GMP& FDA Inspected Facility Spike Free - No Amino Spiking Slow-Release Anti-Catabolic Protein NutraBio Micellar Casein is a slow-absorbing protein that provides a steady stream of amino acids to muscle cells, lasting upwards of 8 hours.