Is dairy in the U.S. safe to consume?

Is dairy in the U.S. safe to consume? The USDA recommends adults have three servings a day and our children are pushed to drink milk by their parents, doctors, and schools but the milk of today is not at all the same as the dairy our ancestors ate.  The growth hormones and estrogen given to cows cause rapid cell division and the hormones end up in the milk. According to a Harvard School of Public Health researcher, Dr. Walter Willett, No one is manning the shop keeping track of exactly how much of these hormones ends up the milk.  He and colleagues have done studies that show there may be more harm than good done from dairy consumption, that it may be better to take calcium supplements, and that low vitamin D may be the real health problem.  Below is a link to an article about some U.S. dairy and the cancer link.

http://www.news.harvard.edu/gazette/2006/12.07/11-dairy.html