What is L-Norephedrine?

[HumanShell]

I know norephedrine used to be in Adipokinetix, and that it was known as PPA. Then the ingredient went extinct and was taken out of Adipo and that fat-burner MQ used to push. NYC uses L-Norephedrine, what is it? <3

 

[gsxr1000]

L and D refer to isomers of amino acids. Whenever you purchase a supplement I'm pretty sure they are all the L isomer because the D isomer isn't processed well by the body.

Someone correct me if I'm off on some of this information.