Administration of the pineal hormone melatonin (MEL) lowers serum gonadotropin (GN) levels, delays sexual maturation and elicits gonadal atrophy ... testosterone (T) and prolactin (PRL) were ...

‘It affects all hormones involved in the hypothalamus-pituitary-gonadal axis, as well as prolactin and oxytocin production, stress hormones, thyroid function, circadian rhythm, growth hormone ...