Development of a simple analytical method using capillary electrophoresis-tandem mass spectrometry for product identification and simultaneous determination of free amino acids in dietary supplements containing royal jelly

► CE-MS/MS method developed for RJ products to determine amino acids and authenticity. ► This method required no concentration step to prepare the samples. ► All 16 amino acids were determined without derivatization. ► The method was useful for distinguishing between RJ and honey.