DHEA (dehydroepiandrosterone) is a hormone produced by your body's adrenal glands. The problem with DHEA supplements is that it is a persecutor to BOTH male and female sex hormones. I.e. testosterone and estrogen.
In my opinion, there are much better options. Unless you are sufficient in DHEA, using DHEA will probably raise testosterone and estrogen levels in equal amounts. That's obviously not what you want.
I personally would use a good natural testosterone booster like HCGenerate from n2bm.com or a topical DHEA product that has anti-estrogen ingredients added like RS Transderm. That way you get the testosterone boosting effects with none of the possible estrogen related side effects.