It is very easy to overdose and get too much absorption and then it is like you are on a gear cycle (in which case I have gathered it does not work). From what I have read and gather it only works (and only sometimes) if you are on nothing else, take the proper dosage (not too much, not too little, DHT in super mega dosages can actually activate the ER just like estrogen can), take it for a long period of time and allow it to shut down most of your natural testosterone levels. Some speculate its main route of action is achieved by relpacing your main source of androgens with DHT instead of testosterone and hence there is simply less systemic convession of testosterone to estradiol/estrogens via aromatase( DHT is not aromatizeable). There are other ideas about how it might work but this one is specualted as being perhaps the most important.