clen and eca work on same principle, the only clinically significant difference being duration of effect. clen has much longer half life.
i prefer ECA with ma huang. i've been using it for 14 years and i've yet to find anything better. it has medically documented evidence
to back it. fat loss, preserves lean mass ( not one bit catabolic ) and no rebound. not to mention increased energy / intensity while
training.