Chosen 1 (1-DHEA) is not a steroid, however, it is a unique precursor to a powerful testosterone derivative known as 1-testosterone. It isn't the exact version of natural testosterone produced in the body, but differs from actual testosterone only by a double bond isomer. As a complex compound, they are both different, however 1-testosterone is considered much more potent. It has an anabolic:androgenic ratio of 1:2, meaning drier gains and more aggression in the gym.
I haven't had this before but since I've been taking it (1 tablet pre-workout and one in the evening) I've found it to be a good hardener. I'm quite impressed considering it doesn't have some extravagant formula like a lot of testosterone boosters.