they all hammer the shit outta hte beta-2s so yeah.. the 2 on clen 2 on ephed is pointless where as clen is specific to which recepters it hits ephedra is like a sledgehammer smashing em all..

so there is no refreshing the beta'2s w/o utilizing benedryl atleast every 3rd week but people say it doesnt work it does just have to eat tons of it and monitor ur bp constantly to know wat dose clen u shud be taking