What are the possible side effects of Horsetail (Equisetum Arvense)?
There are few scientific studies or reports of side effects with horsetail. It is more often used in Germany and Canada, where it is traditionally considered to be safe when taken in appropriate doses. E. palustre (marsh horsetail) contains a poisonous ingredient and should be avoided. There are reports that some batches of E. arvense (horsetail) have been contaminated with E. palustre. Large doses of horsetail may cause symptoms of nicotine overdose, including fever, cold hands and feet, abnormal heart rate, difficulty walking, muscle weakness, and weight loss. People who smoke or who use nicotine patches or nicotine gum should avoid horsetail. Reports from animal studies and one report of a nicotine-allergic person describe a rash occurring after the use of white horsetail. Other reports from use in animals describe nausea, increased frequency of bowel movements, increased urination, loss of the body’s potassium stores, and muscle weakness. People with kidney disorders should avoid h
