Prolactin is the hormone that stimulates milk production for breast feeding in women. It works by regulating water and mineral movement across cell membranes—It facilitates the transport of sodium, calcium, and other minerals into milk, ensuring proper nourishment for the baby. During pregnancy and lactation, progesterone levels are high enough to counterbalance prolactin’s effects, much like how progesterone offsets estrogen’s influence on breast tissue. Outside of breast feeding, high prolacti