volume 48, issue 2, P218-222 1987
DOI: 10.1016/s0015-0282(16)59345-5
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Abstract: The relationship between the concentrations of melatonin and prolactin (PRL) over 24 hours has been investigated. Two peaks in PRL concentrations were distinguished: an evening peak (at 8:00 P.M.) and a nocturnal peak (at 6:00 A.M.). Melatonin concentrations showed a single peak (at 2:00 A.M.). In both the follicular and luteal phases of the menstrual cycle, melatonin increased 2 to 3 hours after the evening increase in PRL and 4 hours before the nocturnal rise in PRL concentrations. Oral administration of mel…

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