Im not trying to say your wrong, Im jut givig my opinion. I know that I did get better results fro 1,4adione when I ran it by itself at 900mg a daythan when i ran 1,4diol at 900mg by itself, But when Im running it with some 1test or in any other cycle I really cant tell the difference (nothing better, nothing worse). I don want to start the whole diol/dione thing up again, Im just going by my personal experience and knowlegde. I usully just reccomend the dione version for 1,4ad to all my bros. I know for sure with 1adione he results were much betterthan the current 1adiol. I think it comes down to what yor going to be using it for, and the price. 1adione powder from mike is inexpensive, there arnt many diol versions out there and they are usually expensive. If mike didt have the dione version, I would be using the diol version rather than support molecular.