try siberian ginsing
i've taken it for many years, its works great and its good for you
no side effects
sibergin is probably the best one on the market, here is the first link i could find to it
http://shop.store.yahoo.com/sportsnu...gin5030ca.html
and the best part about it, is that its body activated
will still give you a nice boost if you're not active mentaly of physically
but will give an even bigger boost when or if u are active durring that day