This Whey Protein Isolate has been tested for antibiotic residue and is free of Recombinant Bovine Growth Hormone (rBGH). ProWhey is minimally processed so that the proteins remain undenatured, soluble and have utmost physiologic activity and benefit.* ProWhey contains naturally occurring immunoglobulins, powerful physiologic factors that help support and maintain a healthy immune response.* ProWhey is produced from milk provided by New Zealand dairy cows that graze on pesticide and chemical-free natural grass pastures. ProWhey is available in two flavors: Plain, and Natural Vanilla.