Testosterone phenyl propionate. More androgenic feeling and not much water retention. It also denses me up big time, like I can't even bend. Those who say test is test, the theory is the ester breaks off leaving regular bio-identical testosterone behind. But I think that's not happening. I think the ester is changing the effects of the testosterone molecule. Maybe it's not breaking off when it binds to the receptor? That would explain alot of things. So the question of favorite test is a valid one.