It can give some energy. It also can speed up your heart rate and combined with caffiene or St John's Wort will give you that jittery/shaky effect. Also it's not so good combined with Valerian Root or Kava Kava as they are supposed to have a calming effects. I know my mother accidentally took it with Valerian and ended up with a palpatating hearts, shaking hands, and a panicy feeling. Gave her the creeps. It is supposed to improve male function too and help people who have diabetes to regulate their blood sugar levels.
Here's a medical source on the subject of Ginseng boosting energy.
http://my.webmd.com/content/article/...tselectedguid={5FE84E90-BC77-4056-A91C-9531713CA348}
Also another page about drug interactions and things to watch for. As my mother found - Ginseng can interact fairly strongly with other herbs and drugs.
http://my.webmd.com/content/drugs/2/...tselectedguid={5FE84E90-BC77-4056-A91C-9531713CA348}
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