27 g/Serving of Protein Providing Fast-Action Whey Protein Isolate Plus Extended-Action Micellar Casein Derived from New Zealand Grass-Fed Cow not Treated with rBGH or Antibiotics‡ Microfiltered No Sweeteners/Artificial Flavors No Added Sugar Low Sodium/Cholesterol Gluten Free Dietary Supplement Instantized PowderBluebonnet"s 100% Natural Dual-Action Protein is sourced from grass-fed cows in New Zealand that are not treated with antibiotics and recombinant bovine growth hormone (rBGH), also known as bovine somatotropin (BST)‡. Additionally, this product provides a dynamic blend of whey protein isolate and micellar casein that works throughout your workout and during the recovery phase at night. Whey protein isolate has the highest biological value (BV) of any protein on the market, which refers to a protein that has all the necessary essential amino acids for protein biosynthesis and is fast-acting to support amino acid replenishment required during and after strenuous activities. Plus, this revolutionary protein formula includes extended-action micellar casein that works well beyond strenuous activities to continually rebuild broken down muscle. While both whey protein isolate and micellar casein are rich sources of branched chain amino acids (BCAAs) and glutamic acid, whey protein isolate alone provides the naturally occurring immunoglobulins that help support the immune system, which is transiently depressed strenuous activity.Unlike the common practice of using heat-processed whey protein isolate and micellar casein that can denature (render useless) the protein and immunoglobulins, Bluebonnet employs a special low-temperature, microfiltration process that removes excess fat while leaving the protein undenatured and immunoglobulins intact.‡The Federal Government has determined there is no significant compositional difference in the milk or milk byproducts from rBST or rBGH treated or untreated cows.