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In humans, ~30 μg of melatonin is produced daily and 80% of the total amount is produced in the night (W). The plasma maximum concentration of melatonin at night are 80–120 pg/mL and the concentrations during the day are between 10–20 pg/mL. [76] [77]
The popular sleep aid can have side effects.
Melatonin may be useful in the treatment of delayed sleep phase syndrome. [9] Melatonin is known to reduce jet lag, especially in eastward travel. However, if it is not taken at the correct time, it can instead delay adaptation. [30] Melatonin appears to have limited use against the sleep problems of people who work shift work. [31]
Large doses of melatonin can even be counterproductive: Lewy et al. [48] provide support to "the idea that too much melatonin may spill over onto the wrong zone of the melatonin phase-response curve." The long-term effects of melatonin administration have not been examined. In some countries, the hormone is available only by prescription or not ...
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Study up on the major pros and cons of popping this supplement in an attempt to sleep more soundly.