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Normal prolactin levels for men range from 3 to15 nanograms per milliliter or 3 to15 micrograms per liter. For nonpregnant women, the range is 4 to 23 nanograms per milliliter or 4 to 23 micrograms per liter, according to WebMD.
Prolactin is a hormone made in the pituitary gland at the base of the brain. The only known function of prolactin in humans is stimulation of breast milk production. Prolactin is also present in men, but there is no known function.