this 1-ad is suppose to not change into estrogen as some pro-hormones do . i am still reading up on it if anybody wants to learn more go to www.ergopharm.net. also when i toook dhea years ago it made me mean and agressive. last nit after my third dose i was a little edgy . i am also taking tribulus terrestris which i got good results from before. i have taken 2- different 19-nors and did not find that much difference than the andro. this 1-ad is suppose to help use your own nauturall test. we will see. david