Norephedrine Hcl is technically not thermogenic in humans, only mice (ask Mr. X or Par Deus)...however, it is a powerful appetite suppressant, and this is more important than a slight increase in BMR in my opinion.....however, most stacks with Norephedrine in them also have yohimbine hcl and caffeine (Adipokinetix, the old MD6, ect)...the yohimbine hcl (even at only 3 mg) can raise my body temp. to over 99 degrees.....perhaps i am sensitive to it, but i find these stacks to be more effective than ECA stacks.....i recently stacked Adipokinetix with 25 mg of ephedrine per dose and get good results....BE CAREFUL THOUGH!!! Some people can't tolerate the mix of yohimbine and ephedrine...if you do decide to stack the two, only use a small amount of yohimbine (like the 3 mg in Adipokinetix) per dose, and consult with Mr. X, MS or another moderator for instructions.