Last update July 2, 2015

Field horsetail

High Risk

Poorly safe. Evaluate carefully. Use safer alternative or interrupt breastfeeding 3 to 7 T ½ (elimination half-lives). Read the Comment.

On latest update no relevant published data on breastfeeding were found.

Side effects and toxicity have not been tested, therefore its use would be preferably avoided or as much use it infrequently.

Topical use is compatible with breastfeeding whenever it not used on the nipple.

Stems of horsetail are used. It contains mineral salts (Sílicium, Potassium), flavonoids and steroids.

Unproven effects are: diuretic, wound healing for burning injuries.

Prolonged or abusive use may produce gastritis, vomiting, sea-sickness or stupor.

May be confused with Equisetum palustre which is toxic due to that it contains Thiaminase and be cause of severe Vitamin B1 deficiency.

A case possibly related to the appearance of Autism after the prolonged use in pregnancy has been described.


We do not have alternatives for Field horsetail.

Suggestions made at e-lactancia are done by APILAM team of health professionals, and are based on updated scientific publications. It is not intended to replace the relationship you have with your doctor but to compound it. The pharmaceutical industry contraindicates breastfeeding, mistakenly and without scientific reasons, in most of the drug data sheets.

Jose Maria Paricio, Founder & President of APILAM/e-Lactancia

Your contribution is essential for this service to continue to exist. We need the generosity of people like you who believe in the benefits of breastfeeding.

Thank you for helping to protect and promote breastfeeding.

José María Paricio, founder of e-lactancia.

Other names

Field horsetail is also known as Horsetail. Here it is a list of alternative known names::

Field horsetail in other languages or writings:


Field horsetail belongs to these groups or families:


Main tradenames from several countries containing Field horsetail in its composition:


  1. Ortega García JA, Angulo MG, Sobrino-Najul EJ, Soldin OP, Mira AP, Martínez-Salcedo E, Claudio L. Prenatal exposure of a girl with autism spectrum disorder to 'horsetail' (Equisetum arvense) herbal remedy and alcohol: a case report. J Med Case Rep. 2011 Abstract Full text (link to original source) Full text (in our servers)
  2. WHO. World Health Organization. WHO monographs on medicinal plants commonly used in the Newly Independent States (NIS). WHO monographs. 2010 Full text (in our servers)
  3. EMA-HMPC. Community herbal monograph on Equisetum arvense L, Herba. London: EMA. Doc. Ref. EMEA/HMPC/394894/2007. 2008 Full text (link to original source) Full text (in our servers)

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