Correspondence to M. Kaszkin, Pharmacentrum Frankfurt, Keinikum der J. W. Goethe-Universität Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany kaszkin@em.uni-frankfurt.de)
Concern for a solid and credible scientific basis in medical herbalism and for professional standards in practice led Hein Zeylstra to establish a professional body appropriately moderated. Today, it continues to set the standard worldwide as the body for