Generally, it won't be medicine, because there is no active ingredient at all. To put it bluntly, it won't produce any benefits but it won't go wrong. Unless you buy a fake, you don't know what is mixed in it. If you really feel no energy and really want to drink, buy some Guhan health essence oral liquid. Or mix some American ginseng and drink a bottle of red bull before the exam, which will make you refreshed and refreshed. It's much better than life one. It's brain tonic or something.