Bluebonnet Whey Protein isolate is sourced from grass-fed cows that are not treated with antibiotics or recombinant bovine growth hormone (rBGH), also known as bovine somatotropin (BST). additionally, whey protein has the highest biological value (BV) of any protein on the market, which refers to a protein that has all of the essential amino acids in adequate quantities to sustain growth and development. That's why Bluebonnet Whey Protein isolate uses high-quality, microfiltered whey protein isolate with important Immunoglobulins, which help support the immune system. Whey is also a rich and source of Branched Chain Amino Acids (BCAAs) and glutamic acid.◆