Phytotherapy: A Quick Reference to Herbal Medicine - Francesco Capasso, Timothy S. Gaginella, Giuliano Grandolini, Angelo A. Izzo - Google Books

https://books.google.de/books?id=PGsrBgAAQBAJ&pg=PT92

About 30% of all prescriptions issued in the USA, Canada and Europe contain either a herb, a purified extract or an active component derived from herbs. However, medical practitioners are often confused by conflicting information available on the safety…