Milk and Hormones Fact Sheet Print Email Friend  

Bovine somatotropin (bST) is a naturally occurring protein hormone in cows. bST helps young cattle grow and adult cows produce milk. It is not a steroid, but rather a protein hormone. A small amount of this hormone is naturally present in all milk, including organic products. When you drink milk, bST is completely broken down by digestion like any other protein.