Horseradish (Armoracia rusticana) is a plant. The roots are often used as a condiment and eaten with beef and fish. They are also sometimes used as medicine.

Horseradish might help fight bacteria and stop spasms.

People use horseradish for urinary tract infections (UTIs), colic, gout, and many other conditions, but there is no good scientific evidence to support these uses.

Don't confuse horseradish with moringa or wasabi. These are not the same.
When taken by mouth: Horseradish root is commonly consumed with foods. It is possibly safe when used as medicine for up to 12 weeks. But it contains mustard oil, which can irritate the lining of the mouth and stomach. When consumed in large amounts, side effects might include stomach upset, bloody vomiting, diarrhea, and fainting.

When applied to the skin: Horseradish is possibly safe when preparations containing 2% mustard oil or less are used. It can cause skin irritation and allergic reactions.

Special Precautions & Warnings:

Pregnancy: Horseradish is commonly consumed with foods. But it's likely unsafe to use horseradish tincture by mouth regularly or in large amounts when pregnant. This might lead to miscarriage.

Breast-feeding: Horseradish is commonly consumed with foods. But it's likely unsafe to take horseradish by mouth in large amounts when breast-feeding. Horseradish contains mustard oil, which can pass into breast milk and cause serious adverse effects.

Children: Horseradish is likely unsafe when taken by mouth in children under 4 years of age. It can cause stomach problems in young children.

Stomach or intestinal ulcers, inflammatory bowel disease, infections or other digestive tract conditions: Horseradish can irritate the digestive tract. Don't use horseradish if you have any of these conditions.

Thyroid disorders: Horseradish might make this condition worse. If you have a thyroid disorder, speak with your healthcare provider before taking horseradish.


There is interest in using horseradish for a number of purposes, but there isn't enough reliable information to say whether it might be helpful.
Likely effective Effectiveness definitions
Possibly effective Effectiveness definitions
Likely ineffective Effectiveness definitions
Possibly ineffective Effectiveness definitions
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Dosing & administration

Horseradish root is commonly consumed with foods as a condiment.

As medicine, there isn't enough reliable information to know what an appropriate dose of horseradish might be. Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult a healthcare professional before using.

Interactions with pharmaceuticals

Thyroid hormone

Interaction Rating=Moderate Be cautious with this combination.

Horseradish might decrease thyroid activity. Taking horseradish along with thyroid hormone might decrease the effects of thyroid hormone.

Interactions with herbs & supplements

Herbs with thyroid activity: Horseradish might affect the body's production of thyroid hormone. Taking it with other supplements with similar effects might alter thyroid function too much and cause side effects. Examples of supplements with this effect include bugleweed, lemon balm, and tiratricol.

Interactions with foods

There are no known interactions with foods.
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This monograph was last reviewed on 31/05/2023 10:00:00 and last updated on 03/12/2014 19:20:55. Monographs are reviewed and/or updated multiple times per month and at least once per year.
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