A pharmacological dose of melatonin increases PRL levels in males without altering those of GH, LH, FSH, TSH, testosterone or cortisol.
Waldhauser F, Lieberman HR, Lynch HJ, Waldhauser M, Herkner K, Frisch H, Vierhapper H, Waldhäusl W, Schemper M, Wurtman RJ, et al. A pharmacological dose of melatonin increases PRL levels in males without altering those of GH, LH, FSH, TSH, testosterone or cortisol. Neuroendocrinology. 1987 Aug; 46(2):125-30.