17-pro andro contains the PH from PH-17 and two additional compounds:17beta-[1-ketoethyl]-androstane-3b, 17a-diol, Androst-3,5-diene-7, 17 dione. The addition of the AI further assists the ability to keep gains lean and dry. The dose is small compared to a normal serving size of this AI that is traditionally used.
So what is the difference in the 3b version of the PH compared to the 3-one ? Is it a wet compound and is the reason they added the AI? If so, I'd rather just high dose the original PH-17