Micellar casein provides a lengthy release of amino acids because of its unique digestibility. It forms a gel in the stomach, slowing the transit time in the digestive system thus slowing the digestion of the protein. This makes it ideal when a slow and lengthy supply of protein is needed. The micellar casein offered by Reflex Nutrition is manufactured by ultra filtration of skimmed milk - this process removes excess lactose and fat. The resulting raw material is about 85% protein. In a ground breaking study (1), carried out by Dr Yves Boire, the differences in metabolic responses of whey protein and casein were individually observed over a 7 hour period in 16 young & healthy volunteers. The findings were very interesting, and have shown that both Casein and Whey have very different applications when it comes to maintaining and building muscle tissue.