ECA is a great fat burning stack. On the side of caution, if your hematocrit percentage and platelet count are on the higher side. Be aware that Ephedrine is similar in molecular structure as epinephrine (adrenaline), in which increased levels of epinephrine raise both Hematocrit and platelet formation, as well induces some platelet microaggregation in vivo. If one is using AAS, it's well known the effects on increased hematocrit and platelet aggregation. With aspirin use which irreversibly blocks the formation of thromboxane A2 in platelets. Thromboxane are responsible for the aggregation of platelets that form blood clots. So take aspirin with Ephedrine.