What % of the active ingredient in transdermal PH's do you think actually make it through the skin?

I,m guessing probably less than 50%.

On top of that we have to consider that for PH's which need a conversion to take place such as 4 AD to testosterone the rate of conversion could be correspondingly low.

So for example if I applied 40mgs of 4 AD twice a day (=80mgs)actual 4 AD absorbed could be only 40mgs. If only 50% of this then converts to test, then I am getting an extra 20 mgs of test a day which = 140mgs a week.