Steroids vastly increase the raw work capacity, period. For this list, I think it is pretty safe to include caffeine as an ergogenic aid for all natural bbs. On the other side, I have not ever told anyone to use clenbuterol, nor will I if it is illegal. I do not understand what it is or does. Someone is welcome to post an explanation of it, but that does not constitute an endorsement of it, by them, me, or the list.
Ephedrine is a bit more complicated.
The list does NOT encourage the use of ephedrine per se, but it works and it is legal, so many subscribers use it. The list provides information about it to demystify things and to let people know how to use it as safely as possible if they do choose to use it. IMO, yes, because although it is a stimulant, it only preps your muscles to do their own maximum ability. It fires you up, but it does not actually increase your body's work capacity any more than a thorough warmup or psych up will. Others may disagree with me on this, and that's fine.