Educational information, not medical advice — ask your doctor or midwife.
Garlic mustard is a leafy wild plant in the cabbage family. Crush a leaf and it smells of garlic. It is eaten as a spring salad green and a pot herb.
The botanical name is Alliaria petiolata. In German it is called Knoblauchsrauke. It grows across Europe and is now a fast-spreading weed in much of North America.
European folk healers used it on wounds and for coughs. Here is the plain verdict on that. There are almost no human studies on garlic mustard as a medicine, and long folk use is not proof that it works or that it is safe.
For most people it is best thought of as a free, tasty wild vegetable. Treat any health claim made for it as untested.
No one has shown in people how garlic mustard might work as a medicine.
The chemistry is known, though. When you crush the leaves, a compound called sinigrin is turned into allyl isothiocyanate. That is the sharp "mustard oil" also found in horseradish and mustard seed.
In test tubes, mustard oils slow the growth of some bacteria and fungi. Whether that happens in a wound or in your gut has not been tested.
The leaves also hold flavonoids and vitamin C. In lab tests these mop up free radicals (unstable molecules that can damage cells). A lab dish is not a person, so this does not tell you what a plate of leaves does.
Most research on the plant is ecological. Scientists have studied how its root chemicals harm soil fungi and native seedlings. That work is about forests, not about human health.
Most people meet garlic mustard as food, not as a supplement.
Common forms: - Fresh young leaves in salads, sandwiches and pesto. - Leaves cooked briefly as a pot herb, or stirred into soup. - Seeds ground as a sharp, mustard-like seasoning.
- Roots grated in small amounts, like horseradish. - Dried leaf tea, sold by a few herb suppliers. - Tinctures (alcohol extracts), which are uncommon.
Capsules and standardised extracts are rare. There is no agreed marker compound and no set strength. One product can be far stronger than another.
Flavour changes through the year. First-year leaves are mild. Second-year plants and older leaves turn bitter, and cooking softens that.
European folk healers treated garlic mustard mainly as a wound herb and a cheap spring food.
Herbalists of the 16th and 17th centuries listed it under names such as Jack-by-the-hedge and sauce-alone. John Gerard was one of them. English country cooks chopped the leaves into a sauce for salt fish and boiled mutton.
Uses written down in old herbals included: - Bruised leaves laid on ulcers, sores and gangrene.
- Leaf juice or tea taken for coughs and chest trouble. - Seeds given to clear worms from the gut. - Leaves rubbed on itchy skin and insect bites.
It also mattered as food. The leaves appear early in the year, when other greens were scarce. German households knew it as Knoblauchsrauke and used it much the same way.
Stop using it and get urgent medical help if you notice: - Swelling of the lips, tongue or throat. - Trouble breathing, wheezing or a tight chest. - Hives or a rash spreading across the body. - Repeated vomiting or severe belly pain.
Call emergency services for throat swelling or breathing trouble. These point to a serious allergic reaction.
Book a normal appointment if mouth burning, loose stools or a skin rash last more than a few days. Also see your doctor if a wound you treated at home gets hot, red or starts to weep.
In the UK, EU and US, garlic mustard is treated as an ordinary wild food, not a licensed medicine. No health claim is approved for it.
In several US states and Canadian provinces it is listed as an invasive weed. Selling or moving live plants can be against the law there. Picking on land you do not own needs the owner's permission.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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