Bovine somatotropin (rBST)

Bovine somatotropin (BST), specifically recombinant bovine somatotropin (rBST), is a synthetic hormone identical to a natural growth hormone produced by cows. Dairy farmers sometimes inject rBST to increase milk production in dairy cows. It works by stimulating the cow’s udder cells to produce more milk, leading to higher yields. While commonly used, rBST use is controversial; some worry about animal health, milk safety, and environmental impacts. Regulatory agencies in many countries have approved its use, but consumers can choose whether to buy dairy products labeled as rBST-free.