You can buy milk that comes from cows not treated with the synthetic hormones, but the regular milk is fine. For humans anyway, it may not be so good for the cows. The synthetic hormones increase their risk for mastitis and foot (hoof?) problems. In fact, that's why the European Union and Canada have banned the use of these hormones in dairy cattle - and not because it's bad for humans.
In Depth: Organic MilkRegular Milk vs Organic Milk
Organic milk has many advantages over regular milk, but price isn't one of them. Is organic milk worth the extra cost? What are the benefits of organic milk?
Organic Milk for Kids
Some parents are turning to organic milk as a healthier option for kids because it is made without growth hormones, antibiotics, and pesticides.
Milk Labels - What Dairy Product Labels Mean
Milk labeled as certified organic comes from cows that 1) have been fed certified organic feed and 2) haven't been treated with antibiotics or synthetic hormones.