Hey guys, I know all about your receptors becoming immune to ephredrine and all that after a certain period time. the question is regarding taking it only once a day in the morning before cardio to get my HR up quicker. how long do you guys take your ECA before giving it a rest? so far i have seen my heart rate rise more rapidly while doing cardio, but i dont want to lose that effect. i've only been on for 4 weeks.


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