NONE OF THE ABOVE - they are all way too expensive commercial versions of something you can make yourself for 1/10 the cost and it will be safer cuz you are getting pharmaceutical grade drugs instead of iffy herbal versions which can be under or overdosed.
the only proven active ingredients are caffeine and ephedrine and i can buy 1200 doses of each for 200 bucks canadian[130US] [160 can. on sale rite now][ 3 doses/day=400days worth]
that only works out to 17 cents per dose compare that with 1-4 bucks per dose of various commercial fat burners, WHICH DO YOU THINK IS BETTER?
EVEN BETTER for two hundred US I CAN GET 10 000 dose of clenbuterol[ 20micrograms] and 2000 doses of T3 [3-5yr supply]
the most potent fat burner of all is DNP, but i have not found a good deal on it ,YET! ALSO AN OVERDOSE AS LITTLE AS 4X REGULAR DOSE CAN BE FATAL, so i dont even wanna try it.