Here is a great quote from Dream on the topic:
If you increase testosterone and it causes muscle growth etc., those things should remain.
But you wont be producing a sustained massive amount for the rest of your life (but it does help recover the production level to around peak health) So just apply a bit of logic with the descriptions.
Cholesterol and Plaque can be broken up and removed, and that is permanent. But it gonna build back up if you consume the things that built it up in the first place.
It’s from the same thread, that @KindredSoul posted. It contains a list for permanent and non-permanent fields. This should give you a overview.
Note: in this thread permanent is for fields, that count to the limit of 4 for permanent physical change. Don’t confuse it with permanent results.