Wholesale Vitamins - Nature's Benefits Melatonin 1mg Tablets w/B6. Melatonin is a brain hormone that regulates the sleep/wake cycle. Changes in melatonin secretion associated with things such as Jet-lag, shift-work and sleep-deprivation may cause sleep disturbances. Melatonin used prior to bedtime may help provide sleep support. 40 tablets packed 24 per case.