I would not say that this is the best sleep supplement that you can buy. The reason I say that is because it has no melatonin in it whatsoever. Melatonin really works for me, and the ingredients in this enzymatic therapy supplement are not really too impressive. They do work better than nothing though, so if you are just wanting a little benefit to help you get to sleep then this is not that bad of an option. However there are probably cheaper options.