Hello Rogin,
I am glad to share what I have discovered about Ginseng. Concerning your question about the dosages of Ginseng, I just follow the dosing guideline on the bottle. Not sure if taking less would still benefit you; I would assume that you would still get some benefit. Ginseng can be expensive, you're right about that. I have made it a spending priority for myself, and find that it is not too much of a monthly expense.
Red ginseng is one of the few different kinds that are available. That is why I take the 'Triple Ginseng' formula from GNC. It has Korean, Siberian, and American Ginsengs all in one standardized formula.
Hope that helps.
