safety concern. NCCIH says various kava products have been linked to rare liver injuries, some serious or even fatal.
Kava may be especially risky for people with liver disease, heavy alcohol use, or those taking medications that affect the liver. It is also not a good idea to mix kava with sedatives or other calming products without medical advice.
8. Comfrey
Comfrey is sometimes promoted as a natural herb for pain or inflammation, but oral comfrey is not considered safe. LiverTox explains that comfrey contains pyrrolizidine alkaloids and, when taken
