This is what Macro had to say in a post on another board quite some time ago. Mac or MS - do either of you have any more information on this? Is topical yohimbine hcl enough to make this a non-issue?????
Is ephedrine actually making you fatter?
well YES and NO.
Ephedrine is beta agonist- it increases the release of fatty acids.
Unfortunatly, ephedrine is also a A2 agonist- inhibiting the release of fatty acids from estrogenic fatty deposits (typicaly highest a2 concentrations are hips, thighs, triceps and gluteus)- there may be some upregulation of the a2 from this activity but it is unclear.
What does this mean?
ephedrine helps you burn fat while making certain fatty deposits MORE "stubborn".