The Risk-Benefit Profile of Commonly Used Herbal Therapies: Ginkgo, St. John's Wort, Genseng, Echinacea, Saw Palmetto, and Kava
Ann Int Med 136:42-53, Ernst,E., 2002
Acute Disseminated Encephalomyelitis After Parenteral Therapy with Herbal Extracts: A Report of Two Cases
JNNP 69:516-518, Schwarz,S.,et al, 2000