Melatonin bulk is a hormone made by the pineal gland, a small gland in the brain.  Melatonin bulk helps  control your sleep and wake cycles. Very small amounts of it are found in foods such as meats, grains, fruits, and vegetables. Your body has its own internal clock that controls your natural cycle of sleeping and waking hours. In part, your body clock controls how much melatonin your body makes.
Normally, melatonin levels begin to rise in the mid- to late evening, remain high for most of the night, and then drop in the early morning hours. Light affects how much melatonin your body produces. During the shorter days of the winter months, your body may produce melatonin either earlier or later in the day than usual.
 

Function:
1)Helps regulate other hormones and maintains the body's circadian rhythm.
2)Melatonin has strong antioxidant effects.