More research needed on rBGH's impact on human health
While the American Cancer Society (ACS) has no formal position regarding recombinant bovine growth hormone (rBGH) due to the inconclusive nature of whether drinking milk produced using rBGH significantly increases IGF-1 levels in humans or adds to the risk of developing cancer, this inconclusiveness necessitates further research. ACS explains that "recombinant bovine growth hormone (rBGH) or recombinant bovine somatotropin (rBST) refers to bovine growth hormone that is made in a lab using genetic technology." Another concern with rBGH is that cows treated with this hormone are more likely to develop udder infections, and this can lead to higher doses of antibiotics utilized in these animals. Further, the improper use of antibiotics can lead to the selection and development of antibiotic-resistant bacteria.