A chemical study of MA Huang *, 1

A rapid and simple procedure for the determination of ephedrine alkaloids in dietary supplements by gas chromatography–mass spectrometry

“…In that case, NE was found only in 2 out of 18 dietary supplements. The authors attributed this finding to the different ephedrine alkaloids concentration among different plant species [5,[24][25][26][27][28][29] varieties [30] and part [28][29][30][31].…”