there is a relationship between melatonin and testosterone. As the melatonin level rises towards the end of the day, testosterone levels start to decline. At the night, melatonin levels start to fall and testosterone production peaks. This cycle is essential to healthy testosterone levels.
In the dark winter months, however, the melatonin level is higher than normal, and the testosterone level is lower in many animals.
Light makes melatonin disappear. Light activates the enzymes that break down
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