ph 17 doesn't bind to the androgen receptor very well and thus will not "shut you down" much. that means your body will not have a very hard time returning to normal after you stop taking it.. if you think you need more than an AI and a testbooster afterword's, nolva is plenty strong and you probably don't need anything but it. again tho, over the counter stuff is fine.. in fact is the product you have include the 3,5,7 (same AI as erase) in the ingredients? if so, there is very little chance that you will get shut down.