A huge 1100+ page book accessible online about all the major herbal supplements: http://books.google.com/books?hl=en&id=XYFMOzKsQr0C&dq=botanical+medicines&printsec=frontcover&source=web&ots=eckr-bVrhg&sig=3x_Yl_Q0T7nI4RU29aZA7uJPKDE&sa=X&oi=book_result&resnum=1&ct=result or: http://tinyurl.com/58vard Marilyn