What happens to rbST and IGF-I when we drink milk?
IGF-1 (insulin-like growth factor 1) is also a peptide hormone, like growth hormone. However, the two hormones are not the same. IGF-1 is produced by the liver in response to the pituitary gland’s production of growth hormone. The concentrations of IGF-1 in cow’s milk (which is similar to the concentration of IGF-1 in mother’s milk) is much lower than the concentrations of IGF-1 in the digestive fluids in our gastrointestinal tracts. The amount of IGF-1 in cow’s milk is simply too small to have any effect.