What is Horehound?

Horehound is a bitter herb from the mint family, used mainly for coughs and for poor appetite. The dried leaves and flowering tops are the parts used. It is the flavour behind old-fashioned horehound candy and cough drops.

The plant is also called white horehound. It grows as a grey, woolly weed in dry, poor soil. It spread from Europe and North Africa to the Americas and Australia.

Here is the honest verdict: human evidence is thin. Long use in folk medicine is not proof that it works, and it is not proof that it is safe. In 1989 US regulators dropped it from approved over-the-counter cough products because proof of effect was lacking.

How does Horehound work?

No one has shown clearly how horehound works in people. The ideas below come from its bitter taste and from lab work.

Bitter herbs are thought to trigger saliva and stomach juices when you taste them. That is the usual reason given for taking horehound before meals. This effect has not been well measured for horehound itself.

In animal studies, marrubiin and related compounds appear to relax smooth muscle and dull pain. In test tubes, extracts show antioxidant activity and slow the growth of some germs. Whether any of that happens at the amount in a cough drop is unknown.

For a cough, part of the relief may be simple. Sucking a sweet, sticky lozenge coats the throat and makes you swallow. That soothing comes from the candy base as much as from the herb.

One small, uncontrolled study in people with type 2 diabetes (high blood sugar) reported lower blood sugar after drinking the tea. There was no comparison group, so it proves very little.

What forms does Horehound come in?

Most people meet horehound as a hard candy or cough drop.

Dried leaf is sold loose or in tea bags. It makes a very bitter tea, often mixed with honey.

Liquid extracts and alcohol tinctures are sold in herb shops. Syrups and lozenges aimed at coughs are also common.

Capsules of powdered dried herb are sold as supplements. Some bitter tonic blends include it with other herbs.

It is used as a flavour in a few traditional ales and herbal liqueurs.

Labels differ widely in how much herb they contain. Candy is mostly sugar, which matters if you watch your blood sugar.

Where it comes from:

Horehound has been used in Europe since ancient times, and settlers carried it to North America.

American folk healers and the Eclectic doctors of the 1800s listed it for coughs, colds and tight chests. They also gave it as a bitter tonic for weak appetite and slow digestion. Some writers used it for worms and for missed periods.

Horehound candy was a household staple in 19th-century America. It was made at home with sugar and a strong tea of the herb.

Germany's herbal review board later allowed the herb for appetite loss and mild stomach upset. That ruling leaned on long use rather than strong trials.

What does Horehound help with?

• Cough and chest congestion: This is the classic use, and the evidence for it is weak. Folk and Eclectic practice treated horehound as a cough herb that loosened thick mucus. There are no good controlled trials in people showing it eases a cough. In 1989 US regulators ruled it not proven effective for over-the-counter cough products. Any relief from a lozenge may come from the sugar and the act of sucking. That soothes a throat whatever herb is in it.
• Sore or scratchy throat: A horehound drop can feel soothing, but the herb itself has not been tested for this. Sweet, sticky lozenges coat the throat and boost saliva. That is a real short-term comfort, and it is not unique to horehound. See a doctor if a sore throat lasts more than a week or comes with high fever.
• Poor appetite: This is the use with the best traditional standing, though human trials are still lacking. Bitter herbs have long been taken in small amounts before meals. Germany's herbal review board allowed horehound for loss of appetite on that basis. The ruling rested on long use, not on modern trials. If you have lost appetite or weight without trying, see a doctor first. That change can signal illness that needs proper checking.
• Indigestion and bloating: Tradition used the bitter tea for full, sluggish digestion after meals. Evidence in people is thin. Bitters in general are thought to raise stomach juices, but horehound on its own has not been well studied for this. The herb can also irritate the stomach in larger amounts. That makes it a poor choice if you already have reflux or an ulcer.
• Blood sugar control (traditional claim, weak evidence): Do not treat horehound as a diabetes remedy. The evidence is very limited. Animal studies suggest extracts may lower blood sugar. One small human study with no control group reported lower readings after the tea. That is not enough to rely on. If you take insulin or other diabetes medicine, horehound could push your sugar too low, so speak to your doctor first.

Which foods are rich in Horehound?

Horehound is not a nutrient, so no food is a natural source of it. You will meet it as a flavour in hard candy, cough drops and a few traditional ales and liqueurs.

What are the side effects of Horehound?

• Stomach upset and nausea
• Vomiting after large amounts
• Loose stools or diarrhoea
• Low blood sugar, mainly if you take diabetes medicine
• A drop in blood pressure, reported mostly in animal studies
• Irregular heartbeat, reported with very large amounts
• Skin rash or mouth itching in people allergic to mint family plants
• Sugar load and tooth decay from candy forms

Good to know:

In food amounts, such as a few candies, horehound is usually well tolerated.

Most reported problems come from strong extracts or large doses. Stomach upset is the most common complaint.

The serious reports are rare but real: very large amounts have been linked to irregular heartbeat, and blood sugar may fall in people on diabetes medicine.

How much Horehound should you take?

• Recommended daily: Labels differ a lot, so treat any figure as a product label, not as advice for you. Tea products often list about 1 to 2 grams of dried leaf per cup. European traditional-use guides cite roughly 4.5 grams of dried herb a day in total. Cough drops carry only a small amount per piece. A pharmacist or your doctor can tell you what fits your health and your other medicines.
• Best time of day: Timing depends on why it is being used. As a bitter for appetite, it is traditionally taken shortly before a meal. For a cough, people use lozenges through the day as needed. There is no evidence that any one time of day works better.
• With or without food: Bitter tonics are traditionally taken 10 to 30 minutes before food. If the herb upsets your stomach, taking it with food may help. Lozenges can be used at any time. The tea is very bitter, so many people add honey or mix it with other herbs.
• Time to effect: A lozenge can feel soothing within minutes, mostly from the sweet, sticky coating. Any bitter effect on appetite would be felt within the same meal. Claimed effects on digestion or blood sugar have not been shown in good human trials. It may also do nothing at all for your symptoms.
• How long to take it: Traditional use is short term, usually days rather than months. For a cough, people use it while symptoms last, often up to a week or two. There is no good safety data for long, daily use. Stop and see a doctor if a cough lasts more than two weeks.