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Hazardous Herbs



Hazardous Herbs

Some people believe that all herbal products are safe. This is far from true. Although this is not a complete list of unsafe plants, those mentioned deserve special attention.

The following herbs are dangerous and should not be used as remedies.


Plants and Potential Danger


Borage Harmful in large doses; may cause liver damage and cancer


Broom Toxic; diuretic


Chaparral May cause illness; banned in the United States


Coltsfoot May cause cancer


Comfrey May cause liver damage and cancer (but not through
external use)


Foxglove Potent heart toxin


Pennyroyal The essential oil may cause convulsions in large doses; possibly harmful to pregnant women


Pokeweed May cause respiratory paralysis and convulsions



Plant and Potential Danger


Rue May make skin more susceptible to damage from sunlight


Sassafras May cause cancer


The following herbs are potentially dangerous and should be used with caution.


Plant and Potential Danger


Aloe vera The juice can be a powerful laxative when used internally (gels labeled for internal use do not have this effect)


Ephedra Should not be used by people with heart conditions, high blood pressure, diabetes or thyroid disease


Juniper Should not be used by women who are pregnant or people with kidney disease


Licorice Exessive amounts may cause fluid retention and high blood pressure


Yohimbe Side effects include nausea, vomiting, high blood pressure, palpitations, insomnia and tremors