Herbal remedies are a form of natural medicine which primarily operates through plants and plant based derivatives. This usually means using plants which contain a biologically active alkaloid. Books about the subject are vitally important, as they can guide one into using the correct plants at the correct doses. Too small of a dose won't work, and too high could be dangerous. As such, a book will help one stay within the desired range. Это и многое другое вы найдете в книге Natural Effects of Herbal Healing (Jeremy P Stanfords)