Only real ephedra has ephedrine alkaloids or DMAA (1,3 dimethylamylamine). Most ephedra products use high amounts of caffeine or a combination of caffeine and PEA (phenylethylamine) which is inferior to DMAA or ephedrine alkaloids for weight loss. I have taken many ephedra product and found that the Stimerex Hardcore is the strongest and probably one of the most effective in the market right now. I am testing the new Yellow Bullet AMP to see which of the two work better for me. I got both at the thatswholesale ephedra site. Online ordering was straight forward and got my package very quickly. They ship from New York which is very close to me.