Usn whey isolate is formulated with pure whey protein isolate this ultra pure protein source has gone through a more intense and meticulous cold filtered purifying process to deliver a product with far less fat and carbohydrates than regular whey protein concentrate the system to analyse and prove the quality of a protein source is called pdcaas protein digestibility corrected amino acid score which is utilized to establish the percent daily value for nutrients on food labels the maximum pd