why is asprin needed in an eca stack?

[M302_Imola]

is it safe to run EPHEDRINE and clen at the same time?

Hell no, why would you want to do that? Ephedrine and clen target the same beta-2 receptors, so the combo would be overkill.

Also, the caffeine prolongs the effects of the ephedrine while the asprin prolongs the effects of the caffeine in an ECA stack, so all three benefit each other.