Ginseng can be toxic with heavy use:
American Ginseng (Panax quinquefolius) - RxList Herbal FAQ
Diet pills should be avoided. Only use them as a last resort or to break a loss stall.
Any metab boosting your body adjust to it in about 8 weeks or so. (meaning it wont work like it did at first)
If you do take any type of diet pill I think its best to take it for only a month and skip a couple months inbetween to let your body heal from any stress created by the pill.
Things I or my s.o. have tried and worked:
-classic dexatrim - green tea dexatrim if you need a bit more energy
I think its really good to take for PMS muchies or right after you lose 10 pounds or more and get rebound hunger. (something I notice on diets)
-Zantrex 3 - this stuff ripped 15 pounds off my guy. I didnt take it because he said it felt very caffine-ish/tad speedy.
AVOIDS:
Hydroxycut - blah...just made me feel sick so of course I would lose weight if I felt like I was going to puke the whole time I was on it. It didnt even work for my guy at all.
New Xenadrine - without ephedra didnt work for him at all