Fast DigestingWhey Protein Hydrolysate Broken down into faster-absorbing peptides, this rapidly infuses muscle-building amino acids. Whey Protein Isolate Digests and absorbs rapidly and is gram for gram, the highest available yield of protein. Whey Protein Concentrate Closest to whole food and contains real subfractions. Slow DigestingEgg Albumin Highly bioavailable and is high in naturally-occurring BCAAs and arginine. Micellar Casein Digests slowly, infusing valuable amino acids over several hours.