Depends on what type you get, if its from Wild Yams, then its junk, body can not use it.
If its synthetic pharmacutical grade then the body can use it to make Testosterone, but if you use it too much the body will convert to excess Estrogen and when that happens you need to take a Zinc Supplement which blocks the conversion to Estrogen. Too much Zinc is also a concern.
I can say that I have been on DHEA for the past 4 days, 25mg a day and I do feel better, might be the placebo effect but a few weeks should give me a good idea of its effects.
Just my .02 from all the research I have done online.