rBGH-Free or rBST-Free. What it means: These labels, regulated by the Food and Drug Administration (FDA), are used on dairy products to tell you that the cows were not treated with the hormone recombinant bovine somatotropin (rBST) – also called recombinant bovine growth hormone (rBGH) – for increasing milk production. LTKFind LTKunder100 LTKGiftGuide