What is Masterwort?

Masterwort is the root of an Alpine mountain plant, Peucedanum ostruthium. German speakers call it Meisterwurz, which means "master root". Folk healers in the Alps used the bitter root for weak digestion, colds, aches and wounds.

You will mostly meet it as dried root, a tincture, or a herbal schnapps. It also flavours some Alpine cheeses and bitter liqueurs. Ointments and poultices were a common folk form.

Here is the honest verdict on evidence. There are almost no human trials of masterwort for any health use. Nearly everything known comes from test tubes and animals.

Long use in European folk medicine is not proof that it works. It is also not proof that it is safe. The root does carry one real hazard: it can make skin burn badly in sunlight.

How does Masterwort work?

No one has shown what masterwort does inside the human body. The ideas below come from lab work and from old folk reasoning.

The root is strongly bitter. Bitter plants have long been used to prompt saliva and stomach juices before a meal. That effect is plausible for bitters in general, but it has not been measured for masterwort itself.

In test tubes, the root's coumarins slow some bacteria and damp down markers of inflammation. In animal and cell work, osthole and related compounds appear to relax smooth muscle, such as gut and airway muscle. Whether any of this happens at the amounts a person takes is unknown.

One mechanism is well understood, and it is a risk rather than a benefit. Furanocoumarins soak up ultraviolet light from the sun. When they sit in skin and sunlight hits them, they can damage skin cells and cause burns or blisters.

Lab studies also suggest these compounds block CYP3A4, a liver enzyme that breaks down many prescription drugs. Grapefruit works in a similar way. This has not been tested with masterwort in people, so the size of the effect is unclear.

What forms does Masterwort come in?

Masterwort is sold mainly as the dried root and as products made from it.

Common forms include:

- Dried cut root, for a tea or decoction - Alcohol tincture, taken in drops - Herbal schnapps and bitter liqueurs - Root powder in capsules, less often - Ointments, oils and poultices for skin - A flavouring in some Alpine cheeses and spirits

The fresh plant is still dug by hunters and farmers in parts of Austria, Switzerland and Italy. That practice carries a serious risk. Several deadly plants in the carrot family look similar in leaf, so wild picking is a job for an expert and not for a beginner.

Quality control is weak. Few products are standardised, and some sold as "masterwort" are a different plant, Astrantia major, which shares the English name.

Where it comes from:

Masterwort was one of the best-known farm remedies of the Alps. Its German name, Meisterwurz, hints at the high standing it once had.

Medieval and early modern herbals listed it for plague, fever and poor digestion. Alpine households kept the root in the kitchen and in the barn. It was also given to cattle and goats, and was carried as a charm against illness and bad luck.

Later European herbal books described it as a warming bitter and a sweat-promoting remedy for colds. None of these uses was tested by modern methods, and the page does not endorse copying them.

What does Masterwort help with?

• Poor appetite and sluggish digestion: This is the most common modern use, and it is the most plausible one. Bitter roots have long been taken before meals to wake up the gut. Human studies of masterwort for digestion are missing. The claim rests on tradition and on how bitters behave as a group.
• Bloating and gas: Folk use treated the root as a carminative, meaning a remedy for trapped wind. The essential oil is the usual explanation. In animal and cell work, related coumarins appear to relax gut muscle. No trial has checked whether masterwort eases bloating in people.
• Colds and feverish chills: Alpine tradition used hot root tea or schnapps to bring on a sweat during a cold. This was a mainstay use for centuries. There is no human evidence that it shortens a cold or lowers fever. Warmth and fluid may explain how it felt.
• Cough and chesty complaints: The root was given for stubborn coughs and tight breathing. Lab work shows some airway-relaxing activity for osthole in animals. That is a long way from proof in people. Do not use it in place of asthma treatment.
• Muscle and joint aches, used on the skin: Ointments and poultices were rubbed on sore backs, joints and bruises. The root was seen as warming. No controlled trials support this. Skin use also raises the main hazard, since the coumarins can make treated skin burn in sunlight.
• Minor wounds, used on the skin: Poultices of fresh or dried root were a standard country wound dressing. In test tubes, root extracts slow the growth of some bacteria. Whether that helps a real wound heal is untested. Modern wound care is safer and better studied.

What are the side effects of Masterwort?

• Redness, rash or blistering on skin exposed to sun after use
• Lasting dark patches on sun-exposed skin
• Nausea, stomach pain or heartburn
• Allergic reaction, more likely if you react to celery, carrot or parsley
• Mouth or throat irritation from the strong bitter taste
• Possible rise in the blood levels of some medicines

Good to know:

The main risk is phototoxicity, meaning skin that burns in sunlight. This is a known property of the furanocoumarins in the root. Skin contact with the fresh plant plus sun is the classic trigger.

Burns of this kind can blister and leave brown marks for months. They are not rare in people who handle plants of this family.

Stomach upset and allergy are the other reported problems. How often side effects happen with commercial products is not known, because no one has tracked it.

How much Masterwort should you take?

• Recommended daily: There is no established dose for masterwort, because no human trials have set one. Products differ a great deal in strength. For context only, labels on European root teas often describe about 1 to 2 grams of dried root per cup. Tincture labels usually list a small number of drops. These are label customs, not a recommendation for you. Schnapps and liqueurs carry alcohol, which brings its own limits. Treat any masterwort product as a herb to discuss with a doctor or pharmacist first, especially if you take prescription medicine.
• Best time of day: Bitters are traditionally taken shortly before a meal, since the taste is the point. That timing has not been tested for masterwort. One timing point does matter. Taking or applying it before strong sun or a sunbed raises the risk of a skin burn.
• With or without food: Tradition puts it just before food, as an appetite bitter. Some people find the root easier on the stomach when taken with a little food. If it causes nausea or stomach pain, that is a signal to stop.
• Time to effect: A bitter taste effect, if any, would be felt within minutes. Anything else is guesswork. It may well do nothing for your symptoms. No study has measured how fast or how often it helps anyone.
• How long to take it: No safe length of use has been studied. Folk use was short and occasional, such as a few days around a meal problem or a cold. Long daily use cannot be called safe on current evidence. The sun-sensitivity risk and the possible drug-enzyme effect both argue against taking it for weeks on end.