19nor? 17aa?

[pheenyx1]

Can someone direct me to a link that breaks down the significance of these classifications? I know 17aa compounds are liver toxic, but would like to see some sort of overview as well as something that shows which steroids fall into which categories.
thanks.

[Lemonada8]

the steroid profiles here are a good place to start.

basically, the 17a is on every steroid (with some exceptions, tren for example) but the addition of the 2nd a makes it able to pass through the liver w/o it destroying it.

a 19nor is a progestin, so its similar to progesterone,but still different. so it can have some estrogenic properties also (deca for joints for example) 19nortestosterone

basically its just the chemical structure

[Bonaparte]

You can determine all this just by looking at the compound's nomenclature.
But if its an oral, it is 17aa (apart from oral primo and proviron).