http://www.mayoclinic.org/drugs-supplements/melatonin/dosing/hrb-20059770 http://www.mayoclinic.org/drugs-supplements/melatonin/dosing... http://www.talkabouts

http://www.mayoclinic.org/drugs-supplements/melatonin/dosing/hrb-20059770 http://www.mayoclinic.org/drugs-supplements/melatonin/dosing... http://www.talkaboutsleep.com/how-to-use-melatonin-correctly/ http://www.talkaboutsleep.com/how-to-use-melatonin-correctly... Number of hours are all over the map. Hey, if you feel its effects within 30 minutes, then that's what you should use...