Journal of Antimicrobial Chemotherapy (2003). Full Text Article. PDF File. Karen W. Martin* and Edzard Ernst. Complementary Medicine, Peninsula Medical School, Universities of Exeter and Plymouth, 25 Victoria Park Road, Exeter EX2 4NT, UK
It is imperative that the type of preparation is known such as whether the fresh or dried herb was used, the extraction ratio, solvent, concentration etc.