I also went to mexico and purchased both spiropent and oxy. Did 2, two week cycles and then had to call it quites. Headaches and shakes were too much for me. I didn't feel like doing cardio while taking it and felt like pulling my hair out most of the time. ECA stack was much easier for me to take and I felt like doing cardio after taking it unlike with the clen. Didn't see any amazing results, I have had better and more noticable results with eca.