Horsetail (Equisetum arvense)


Horsetail Summary

Horsetail is the last remaining member of a class of plants that used to dominate the terrain for over 100 million years. These unusual vascular plants reproduce via spores and have been incredibly successful despite the vast majority of the related species having gone extinct.

They're high in minerals, and offer support through their ability to flush the urinary tract — most people who use this herb use it to support hair and nail growth, or as a diuretic and urinary antispasmodic.


+ Indications

  • Urinary tract infections
  • Prostatitis
  • Benign prostatic hyperplasia (BPH)
  • Incontinence
  • Urinary stones
  • Kidney stones
  • Anemia
  • Chillblaines
  • Chronic heart failure
  • Hemorrhage
  • Wounds (topically)
  • Rheumatic arthritis
  • Emphysema
  • General debility
  • Gout
  • Oedema

+ Contraindications

None noted. Avoid high doses.

Herbal Actions:

  • Diuretic
  • Urinary Antiseptic
  • Urinary Antispasmodic
  • Astringent
  • Styptic (Hemostatic)
  • Vulnerary
  • Antibacterial
  • Antilithic

What Is Horsetail Used For?

Horsetail is mainly used for its urinary antiseptic qualities to treat urinary tract infections (cystitis, urethritis). In men, horsetail is used to treat benign prostatic hyperplasia.

It is also used for its high silica content to support nail and hair growth and is used traditionally for reumatic pain.


Traditional Uses of Horsetail

Horsetail was used in traditional western herbal medicine for cystitis, urethritis, frequent urination, nocturnal enuresis, urinary calculi, renal colic, hematuria, enlarged prostate, prostatitis, to speed wound healing, and to stop bleeding [3, 7].

The British herbal pharmacopeia lists horsetail as a genitourinary astringent, antihaemorrhagic, and prophylactic causing a mild leucocytosis. Topically it is suggested as a vulnerary, and styptic. Indications include enuresis, prostatic disease, and cystitis with haematuria [2].

All species except Equisetum palustre have been used as a food. This is because Equisetum palustre is toxic due to the constituent palustrine (an alkaloid) [5]. In Japan, Equisetum arvense is made into a health drink known as sagina [6].


Herb Details: Horsetail

Weekly Dose

Part Used

Aerial parts

Family Name



Horsetail can be found all over the world, but is most common in North America and Europe in marsh or wetter areas.

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Constituents of Interest

  • Silica
  • Palustrine
  • Salicylic acid
  • Equisetonin

Common Names

  • Horsetail
  • Equisetum
  • Scouring rush
  • Horse pipes
  • Joint Grass
  • Bottle Brush
  • Snake Grass
  • Puzzle Grass







Duration of Use

  • Avoid long-term use in therapeutic doses.

Botanical Information

Horsetail is the only living member of the family Equisetaceae, and the only member of its class, Equisetopsida, as well. This class used to dominate much of the Paleozoic forests for over 100 million years. The class included species that reached monstrous heights, some reportedly reaching over 30 meters tall. Since this time, however, only the lonely horsetail has survived. It is an ancient species and a bit of a time capsule for the other members of the Equisetopsida class of plants.

The class was characterized by vascular plants that reproduce via spores rather than seeds. This makes horsetail unique in a world dominated by angiosperms.

There are reportedly 5 species in the subgenus Equisetum which includes Equisetum arvense, Equisetum sylvaticum, Equisteum fluviatile, Equisetum telmateia and Equisetum palustre [5].


Habitat Ecology, and Distribution

Horsetail is a common European and North American herb, especially surrounding rivers marshes, or other damp areas.


Pharmacology & Medical Research

+ Antioxidant

Equisetum telmateia was found in at least one study to have the highest antioxidant capacity out of several other species including Equisetum arvense, Equisetum sylvaticum, Equisetum fluviatile, and Equisetum palustre [5].

+ Antibacterial

Various horsetail species have been found to be moderately to highly active against gram-positive bacterial strains [8-10].



Chemical class Chemical Name % Dried Weight Solubility
Alkaloids Nicotine, palustrine, palustrinine Unknown N/A
Enzymes Thiaminase Unknown N/A
Flavonols Isoquercetrin, Equicetrin?, Kaempferol, Quercetin, Unknown N/A
Hydrocinnamic Acids Caffeic acid and derrivatives 5-8% N/A
Phenolic Acids Salicylic acid 5-8% N/A
Saponins Equisetonin, Unknown N/A
Sterols Cholesterol, Isofucosterol, Campesterol Unknown N/A
Thiols Dimethylsulphone Unknown N/A
Minerals Potassium salts, magnesium salts 1.5% N/A
MISC Aconitic acid, Unknown N/A

Clinical Applications Of Horsetail:

Horsetail is reliable as a urinary antiseptic and can be used to treat lower urinary tract infections. The silica content in horsetail is very high, which is used as a nutritive for supporting nail and hair growth.



None reported.



Justin Cooke, BHSc

The Sunlight Experiment

(Updated November 2018)


Recent Blog Posts:


  1. Wren, R. C. (1956). Potter's new cyclopaedia of botanical drugs and preparations.

  2. British Herbal Medicine Association. (1983). British Herbal Pharmacopoeia. Bournemouth, UK: Author.

  3. Bone, K. (2003). A clinical guide to blending liquid herbs: Herbal formulations for the individual patient. Edinburgh [u.a., MO: Churchill Livingstone.

  4. Hoffmann, D. (2003). Medical herbalism: The science and practice of herbal medicine. Rochester, VT: Healing Arts Press.

  5. Milovanović, V., Radulović, N., Todorović, Z., Stanković, M., & Stojanović, G. (2007). Antioxidant, Antimicrobial and Genotoxicity Screening of Hydro-alcoholic Extracts of Five Serbian Equisetum Species. Plant Foods For Human Nutrition, 62(3), 113-119.

  6. Nagai T, Myoda T, Nagashima T (2005) Antioxidative activities of water extract and ethanol extract from field horsetail (tsukushi) Equisetum arvense L. Food Chem 91:389–394

  7. Castleman M (1991) The healing herbs. Rodale Press, Emmaus, PA

  8. Herrera RM, Perez, M, Martın-Herrera DA, Lopez-Garcıa R, Rabanal RM (1996) Antimicrobial activity of extracts from plants endemic to the Canary Islands. Phytother Res 10:364–366

  9. Kelmanson JE, Jäger AK, Van Staden J (2000) Zulu medicinal plants with antibacterial activity. J Ethnopharmacol 69:241–246

  10. Ali NAA, Jülich WD, Kusnick C, Lindequist U (2001) Screening of Yemeni medicinal plants for antibacterial and cytotoxic activities. J Ethnopharmacol 74:173–179