There are three ginsengs available. There is red chinese which is processed by steaming and is supposed to be the strongest. It might worsen a tremor, BTW.
Second is the American variety which is a gentler cousin. And there is the Russian which is not a true gensing at all. All are considered adaptogenic which means they enhance one's ability to, well, adapt.
I have a small patch of American growing just outside my window as I write. Originally plannned to retire on it. It is a lot harder to grow than it looks!