Recombinant bovine somatotropine (rbST) is a synthetic version of a naturally occurring protein hormone (bovine somatotropine, or bST) found in all dairy cows. The synthetic version (rbST) works the same way as the naturally occurring version (bST). It is not a steroid hormone; it is a protein. Because rbST is a protein, it is digested like any other protein when consumed. All milk contains hormones, and the levels of hormones are not biologically different between organic milk, rbST-free milk and regular milk. The nutritional and taste characteristics remain the same as well. Plus, rbST improves productivity and sustainability. Six cows supplemented with rbST will produce the same amount of milk as seven non-supplemented cows. The supplemented cows require less feed, less water and fewer resources to make the same volume of milk. Learn more about rbST and milk productivity at Global Dairy Innovation.