Is there any supplement that is a beta 2 specific agonist like clen is? I believe ephedrine affects the beta 1 and 2 receptors. I am interested in a supplement that effects the beta 2 receptors the way clen does.
Ephedrine acts indirectly through adrenalin/noradrenalin stimulation, so all beta receptors get hit to some degree (1-3).
I doubt you'll find anything commercially available. Maybe there's something science hasn't picked up yet.
I dont know about supplements but if you look in a new addition of The ACSM Guidelines for Exercise Testing and Prescription, they have a large list of B-2 agonist that you might could get your hands on. Hope that helps.
Albuterol is selective for the Beta-2 receptor
albuterol is the only one I'm aware of that is B2 only