hahahaha buddy, they're the exact same thing. 4-chloro-17a-methyl-androst-1,4-diene-3b,17b-diol. u'll just be dosing double dose on Hdrol. and watch out for hemadrol. i found a great deal on it awhile back also on some site and i think it ended up being bunk or just was a bad PH. thats just my review on hemadrol.