What Is Yarrow?

An Herb Studied for Wound Care, Inflammation, and Menstrual Pain

Yarrow (Achillea millefolium) is a flowering perennial that grows in North America, Asia, and Europe. It has a rich history as one of the oldest plants used medicinally, with reports of its use dating back 3,000 years.

In test tube studies, yarrow’s active ingredients have been shown to work as antibiotics, antioxidants, antiproliferatives (slowing cell growth), and more. These properties make yarrow a supplement of interest for almost everything from multiple sclerosis to cancer. Here’s what you need to know about yarrow before adding it to your medicine cabinet. 

Dietary supplements are not regulated like drugs in the United States, meaning the Food and Drug Administration (FDA) does not approve them for safety and effectiveness before products are marketed. When possible, choose a supplement that has been tested by a trusted third party, such as USP, ConsumerLab, or NSF.

Keep in mind, however, that even if supplements are third-party tested, they aren't necessarily safe for all or effective in general. Therefore, it is important to talk to your healthcare provider about any supplements you plan to take and to check in about any potential interactions with other supplements or medications.

Supplement Facts

  • Active ingredient(s): phenols, flavonoids, sesquiterpenoids
  • Alternate name(s): Achillea millefolium, devil’s nettle, old man’s pepper, woundwort
  • Legal status: Over-the-counter herbal supplement
  • Suggested dose: Depends on the condition
  • Safety considerations: Contraindicated (use is discouraged) in pregnancy; no data available in children

Uses of Yarrow

Supplement use should be individualized and vetted by a healthcare professional, such as a registered dietitian, pharmacist, or healthcare provider. No supplement is intended to treat, cure, or prevent disease.

Although yarrow has been used traditionally in many cultures for many health conditions, only weak evidence exists to confirm the plant's benefits. Most scientific research has been performed on animals or isolated cells in a lab. This means research is in its early stages. The findings must be replicated in more extensive and in-depth studies before the yarrow's complete safety and benefit profile is established.

Here are some uses that studies in humans have explored:

Wound Healing

Yarrow leaves, or juice made from its leaves, have historically been applied directly to wounds to aid healing. There isn’t much compelling research to support this use.

A randomized controlled trial of 140 women showed a positive effect of yarrow ointments on the healing of episiotomies (a small incision in the perineum that healthcare providers sometimes make during childbirth).

Yarrow has also been studied for its effects on cracked nipples due to breastfeeding. A study of 150 participants showed that yarrow helped, but not more than applying breastmilk or honey to the nipples.

Skin Inflammation

Yarrow is thought to act as an anti-inflammatory and antioxidant when applied to the skin. A randomized controlled trial in volunteers demonstrated that yarrow helped restore artificially irritated skin. Further study is needed.

Red yarrow flowers in the sunlight
ChristopherBernard / Getty Images


There is sparse data supporting yarrow’s use in alleviating pain during menstrual cycles, although people use it anecdotally for this. In one randomized controlled trial yarrow tea was shown to decrease the pain of people experiencing dysmenorrhea (painful menstrual cycles). Only 91 students were involved in the study and all were adolescents, so the effects could differ for other age groups.  

Multiple Sclerosis

A randomized controlled trial showed yearly relapses (acute attacks) decreased in people with multiple sclerosis who were given either 250 milligrams (mg) or 500 mg of yarrow daily for one year. In this study yarrow was given as add-on therapy, meaning it was offered in addition to maintenance medicines. People with multiple sclerosis who took yarrow along with their regular treatments showed improvements on cognitive tests. Further study is needed.

Irritable Bowel Syndrome

Yarrow is sometimes used in treating irritable bowel syndrome (IBS) because of its antispasmodic activity. This means it may decrease muscle spasms in the intestines and ease stomach cramping. So far, there is no substantial evidence to support this historical use.

A randomized controlled trial of 60 people with IBS showed that a mixture of yarrow and two other herbal supplements decreased symptoms. However, the result was not statistically significant. That means that the same thing could have happened simply by chance. Also, it is impossible to predict the effect of yarrow alone for IBS since it was given as a combination product in this trial.

Other Studied Conditions

While data in humans are lacking, some people also use yarrow for:

  • Bacterial infections
  • Respiratory viruses like COVID-19
  • Regulating blood sugar in type 2 diabetes
  • Anxiety
  • Protecting the liver and gallbladder
  • Cancer
  • Chemotherapy-related toxicities
  • Cosmetic uses

It’s important to highlight that most of these studies were done on mouse models or using cells in a lab. It is not known if the effects will be the same in humans. Further research in humans is needed before yarrow is given the green light for any of these uses.

The name "yarrow" applies to about 140 closely related varieties in the genus Achillea. According to one study, this is a complicating factor when it comes to research since many reports haven't always been clear about the exact variety studied. Not narrowing down the type of yarrow makes it difficult or impossible to compare research and draw conclusions.

What Are the Side Effects of Yarrow?

While yarrow is considered a "natural" product, keep in mind that even natural substances can have side effects and drug interactions. Think of these products as you would pharmaceutical drugs. Most of the available safety data come from studies in mice, so not enough is known about side effects in humans yet.

Common Side Effects

Yarrow is generally considered safe to use medicinally, but possible side effects may include:

  • Skin irritation when used topically: Sesquiterpenes (a type of metabolite) in yarrow may cause contact dermatitis or skin rash.
  • Increased urination: Yarrow had a diuretic effect in a rat model.

However, some groups of people may face additional risks from taking yarrow supplements.

Severe Side Effects

In one case report, a woman who consumed five cups a day of yarrow tea for one week went to the emergency room complaining of blurry vision, dry mouth, fatigue, and heart palpitations. These symptoms are consistent with anticholinergic toxicity (a harmful effect caused by halting the action of a neurotransmitter called acetylcholine), which can cause hallucinations, seizures, or coma in severe cases. 

Importantly, there is no data to confirm that yarrow has anticholinergic effects. However, if you experience these or any other symptoms after taking this supplement, head to the emergency room to be safe.


Some groups of people may face additional risks from taking yarrow supplements:

Pregnancy and Breastfeeding

Yarrow is not recommended for use during pregnancy or breastfeeding. An ingredient of yarrow called thujone could put you at risk for miscarriage if you take it while pregnant.

So far, not enough is known about the risk of yarrow during breastfeeding, so it's safest to avoid using it until after your baby is weaned. 

Infants and Children

Because of a lack of studies on safety or efficacy in children, use in this population is not recommended.


If you're allergic to plants that are members of the Asteraceae/Compositae family, you may also be allergic to yarrow. Other plants in the family include:

  • Chrysanthemums
  • Daisies
  • Marigolds
  • Ragweed

If you have plant allergies but don't know for sure about this particular group of plants, talk to your healthcare provider before taking yarrow.

Increased Bleeding Risk

The research on this is quite limited, but a study in rabbits showed decreased blood clotting time when they were given achilleine, an ingredient of yarrow. Because yarrow could theoretically slow blood clotting, you should discuss its use with your healthcare provider before any surgeries. It may need to be stopped prior to the procedure.

Dosage: How Much Yarrow Should I Take?

Always speak with a healthcare provider before taking a supplement to ensure that the supplement and dosage are appropriate for your individual needs. 

There's no established standard dosing for yarrow, although daily dosing of up to 500 mg has been used safely for up to a year in one human study.

Always follow instructions on product labels and include your healthcare provider and pharmacist in your decisions. Look for yarrow supplementation certified by a third party if purchasing it in a store.

What Happens If I Take Too Much Yarrow?

There is insufficient data to predict the effects of taking too much yarrow. If you feel you've ingested too much yarrow, seek immediate guidance from a healthcare provider.


There is very little evidence about yarrow's interactions with prescription medications or other herbal supplements. Yarrow may have a negative interaction with the following remedies, but these are primarily theoretical:

  • Anti-inflammatories, anticoagulants, and antiplatelet drugs: These slow blood clotting; bleeding risk might be increased by taking yarrow.
  • Sedatives: If taken with yarrow, they may cause excessive drowsiness.  
  • Lithium: Yarrow may decrease your body's ability to get rid of lithium, increasing the risk of lithium build-up and severe side effects.

Herbal supplements containing thujone: Thujone is an ingredient of yarrow, and at high doses, it is toxic to the brain and may cause seizures.

It is essential to read a supplement's ingredient list and nutrition facts panel carefully to know which ingredients and how much of each ingredient is included. Please review this supplement label with your healthcare provider to discuss potential interactions with foods, other supplements, and medications. 

How to Store Yarrow

Most commercially available yarrow products can be safely stored at room temperature. Always follow package directions regarding storage and expiration dates. Keep this and all supplements and medications out of the reach of children and pets.

The plant leaves may be dried, though it is unknown how long to keep them on your shelf. Some suggest throwing yarrow out when its aroma begins to fade, as it may become less potent.

Similar Supplements

Many supplements are similarly touted for wound healing, including:

Like yarrow, these herbs have been used extensively in traditional medicine and are available in several dosage forms. 

Sage, cedar leaf, and wormwood are some other herbs that contain thujone. Like yarrow, these should not be used in pregnancy. Check with your healthcare provider before taking yarrow if you are also taking any of these supplements. At high doses, thujone may cause seizures, so the recommended maximum daily amount is 3 to 7 mg.

Frequently Asked Questions

  • Does yarrow help with anxiety?

    Maybe. So far there is no strong evidence that yarrow relieves anxiety in people. Mice that were given yarrow had fewer symptoms of anxiety and did not develop tolerance to yarrow. Tolerance is when an increased dose is required over time to achieve the same effect. It can sometimes occur with other medicines prescribed for anxiety, such as benzodiazepines like Valium (diazepam).

  • Can yarrow improve hair and skin?

    Possibly. Yarrow essential oil is a popular ingredient in skin and hair care. On the skin, yarrow has astringent properties (causes the contraction of skin cells). In hair care, yarrow is said to increase hair growth and soothe scalp irritations. 

  • Does yarrow impact fertility?

    There is no data on yarrow’s effects on fertility in humans. A trial in rats showed it helped male rats exposed to nicotine to reproduce, but this may or may not translate into any benefit for people. Women who are pregnant or trying to become pregnant should not use the herb as it may induce miscarriage.

Sources of Yarrow & What to Look For

Sources of yarrow are the plant itself and supplements made from it.

Yarrow capsules and tincture

Verywell / Anastasia Tretiak

Food Sources of Yarrow

The yarrow root may be ground up to make a spice. Flowers and leaves of the plant are used by some people as ingredients in soups or salads. Yarrow is not a common ingredient in commercially available foods in the United States.

Yarrow Supplements

Yarrow is commercially available in various dosage forms, including herbal teas, capsules, essential oil, ointments, and tinctures. 

Essential oil or ointment applied to the skin may be preferable because of decreased systemic (body-wide) side effects.

Tinctures are highly concentrated extracts made by soaking the plant in alcohol. Doses are taken by mouth using a dropper. Because of the alcohol content (often 25% to 60%), this form may not be recommended in children or during pregnancy. Check with your child’s pediatrician or your OB/GYN before use.


Yarrow has a long history of use in folk medicine and has theoretical benefits for various health conditions. There is only weak evidence to support its use in humans, however. More robust human trials are needed before yarrow can be considered safe or effective. As with all supplements, discuss yarrow with your healthcare provider before adding it to your daily routine.

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Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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Additional Reading

By Megan Nunn, PharmD
Megan Nunn, PharmD, is a community pharmacist in Tennessee with over twelve years of experience in medication counseling and immunization.