rBST Or rBGH

Recombinant bovine somatotropin (rBST), also called rBGH (recombinant bovine growth hormone), is a growth hormone used to increase milk production in cows. Many health-conscious consumers prefer not to consume dairy products from rBST-treated cows. Currently there is no test that can distinguish between milk from rBST-treated and untreated cows. Controlling the source of the milk is the key to guaranteeing that dairy products are rBST-free. Farmers who do not treat their herds generally label their products rBST-free.

The California Milk Advisory Board