The brands of yogurt that use hormone-free milk are Chobani, Fage, Greek Gods, Yoplait Greek, Dannon Oikos, Stonyfield, Nancy's, Strauss Creamery and Wallaby. Dairy products are not labeled as being hormone free.
Recombinant bovine growth hormone or, as it is also called, recombinant bovine somatotropin is injected into cows so they produce more milk. The U.S. Food and Drug Administration approved its use in 1993. However, the use of the hormone is banned in Japan, Canada, Australia and the European Union.
Cows treated with rbGH run a 50 percent higher risk of developing problems with legs and hooves, called lameness, a 25 percent more risk of having mastitis, which is an udder infection, and also might start having problems with their reproductive systems, including infertility, states the Center for Food Safety, a national nonprofit environmental advocacy organization.
Because rbGH can result in udder infections, the cows are often treated with antibiotics. Multiple antibiotic treatments beget antibiotic resistant bacteria and can cause human diseases that are difficult to cure.
Moreover, there are concerns over the "insulin-like growth factor-1" hormone, which is present at a higher level in milk from cows treated with rbGH. This hormone could survive digestion and enter humans' blood stream.