Horseradish is a plant with tall green leaves. The root has a strong odor and flavor and is used in cooking. Horseradish has been used to improve kidney function and to prevent urinary tract infection. It can be taken as a pill, powder, paste, or extract. Horseradish has also been applied to the skin to ease swelling and pain in the joints. It can be used as a salve or oil.


500 milligrams 1 to 2 times daily

What Research Shows

Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.

Safety Notes

It is likely safe to use horseradish on the skin and to take it orally in small doses for a short time, but stomach upset and allergic reactions may happen. Not enough studies have been done to say whether it is safe to use for a long period. Women who are pregnant or breastfeeding and children should limit their use of horseradish.B1


Talk to your doctor about any supplements or therapy you would like to use. Some can interfere with treatment or make conditions worse such as:

  • People taking blood thinners should talk to their doctors before taking horseradish. It may interact with the medicine.


A. Respiratory Tract Diseases

A1. Fintelmann V, Albrecht U, et al. Efficacy and safety of a combination herbal medicinal product containing Tropaeoli majoris herba and Armoraciae rusticanae radix for the prophylactic treatment of patients with respiratory tract diseases: a randomised, prospective, double-blind, placebo-controlled phase III trial. Curr Med Res Opin. 2012 Nov;28(11):1799-807.

B. Safety

B1. Panter KE, James LF. Natural plant toxicants in milk: a review. J Anim Sci. 1990 Mar;68(3):892-904.

C. Urinary Tract Infection

C1. Albrecht U, Goos KH, et al. A randomised, double-blind, placebo-controlled trial of a herbal medicinal product containing Tropaeoli majoris herba (Nasturtium) and Armoraciae rusticanae radix (Horseradish) for the prophylactic treatment of patients with chronically recurrent lower urinary tract infections. Curr Med Res Opin. 2007;23(10):2415-2422.

Last reviewed February 2020 by EBSCO NAT Review Board Eric Hurwitz, DC
Last Updated: 5/27/2020

EBSCO Information Services is fully accredited by URAC. URAC is an independent, nonprofit health care accrediting organization dedicated to promoting health care quality through accreditation, certification and commendation.

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

To send comments or feedback to our Editorial Team regarding the content please email us at Our Health Library Support team will respond to your email request within 2 business days.