Certified Breastfeeding Counselor Practice Exam 2025 – Comprehensive Test Prep

Question: 1 / 400

What is the main inhibitor of prolactin?

Estrogen

Oxytocin

Progesterone

Progesterone is the main inhibitor of prolactin. Prolactin is a hormone responsible for lactation and is primarily produced by the pituitary gland. Other hormones, such as estrogen, oxytocin and testosterone, can also play a role in lactation and milk production, but they do not inhibit prolactin like progesterone does. For example, estrogen and oxytocin can stimulate the production of prolactin, while testosterone does not have a significant effect on prolactin levels. Therefore, while the other options may be involved in lactation, they are not the main inhibitor of prolactin.

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Testosterone

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