Prolactin stimulates the breast to produce milk during pregnancy. After giving birth, a motherís prolactin levels fall unless she breastfeeds her infant. Each time the baby nurses, prolactin levels rise to maintain milk production.

Source: NIDDK (NIH)1

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Prolactin: A lactogenic hormone secreted by the adenohypophysis (Pituitary Gland, Anterior). It is a polypeptide of approximately 23 kd. Besides its major action on lactation, in some species prolactin exerts effects on reproduction, maternal behavior, fat metabolism, immunomodulation and osmoregulation. Prolactin receptors are present in the mammary gland, hypothalamus, liver, ovary, testis, and prostate.2

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  1. Source: NIDDK (NIH): health-information/ endocrine-diseases/ prolactinoma
  2. Source: MeSH (U.S. National Library of Medicine)

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