run-on
Ephedrine used for a long time seems to decrease blood flow to the penis. This is not a good thing. It also can cause prostate problems / "run-on" urination. Also not a good thing.
Many people report no problems but chronic use should be avoided. I know from experience.
As for the starter of this thread. You used the word "natural." Ephedrine is a powerful drug and far from natural. It is however a good cutting drug because anticatabolic, thermogenic, and appetite-suppressing especially when stacked with caffeine.
You can eliminate the aspirin from the stack. It is useless and hurts your stomach lining.