Recombinant Bovine Growth Hormone, also called recombinant Bovine Somatotropin (rBST). This
is a genetically engineered hormone that is injected into dairy cows to increase
their milk production. Cows injected with rBGH have shorter life spans and are
much more likely to suffer from udder infections. rBGH is only legal in three
countries: the United States, South Africa, and Mexico. RBGH has been banned in
Canada, the European Union and elsewhere because of inadequate testing and some
evidence that it leads to cancer.