The most common examples are those that contain alkaloids or that reportedly have triggered toxic reactions. A Survivor's Guide by Gregory T. Everson . Some are herbs that have been documented to cause liver problems ranging from hepatitis to liver failure. Again, it is crucial to get the expert advise and supervision of a qualified professional. Even experienced herbalists avoid prescribing herbs for themselves.
Herbs can have unpredictable effects, particularly if taken in combination.
It is important to consult a practitioner for formulae to suit you. According to Matthew Dolan, certain herbs need to be prepared in precise ways. To find out more details or explanations please consult the appropriate sources of information or your health care practitioner. Please include why and what source you got this information from.