Clown's Mustard Plant Drug Interactions, Uses, Effectiveness, Safety & More

Clown's Mustard Plant is a small flowering herb in the mustard (cabbage) family. Its scientific name is Iberis amara, and it is sometimes called bitter candytuft. It grows in parts of Europe and produces clusters of small white or pale flowers.

This herb is most famous as one of several plant ingredients in a well-known European liquid herbal formula used for digestive complaints. In that product, Clown's Mustard is combined with other herbs such as peppermint, chamomile, licorice, and others. It is much less common to find Clown's Mustard sold on its own.

People most often take it (usually as part of the combination product) for stomach upset, bloating, and symptoms of irritable bowel syndrome.

Researchers believe Clown's Mustard Plant may affect how the muscles in the digestive tract move. In laboratory studies, it has shown a tonic (tightening) effect on gut muscle, while other herbs in the common combination product seem to relax the gut. The idea is that combining herbs with opposite actions may help normalize digestion.

The plant contains natural compounds such as glucosinolates (typical of the mustard family) and flavonoids that may have mild anti-inflammatory or antioxidant effects in lab settings.

These proposed mechanisms come mostly from laboratory and animal research. How well they apply to people is not fully proven.

As part of standardized combination products, Clown's Mustard Plant appears to be reasonably well tolerated in studies. However, safety data for the herb taken alone are limited, so caution is wise.

People with liver problems should be careful. The combination product that contains this herb has, in rare cases, been linked to reports of liver injury, though it is unclear which ingredient (if any) was responsible. Stop use and seek medical care if you notice yellowing of the skin or eyes, dark urine, severe stomach pain, or unusual tiredness.

People with allergies to plants in the mustard or cabbage family should be cautious. Pregnant and breastfeeding people should avoid this herb because there is not enough information to know it is safe. Always check with your pharmacist or doctor before starting any new supplement, especially if you have an ongoing health condition.

When used in the common combination products, reported side effects are usually mild and may include stomach upset, nausea, or allergic-type skin reactions.

Rare but more serious concerns include allergic reactions and, very uncommonly, liver problems reported with the multi-herb formula. Seek medical attention right away if you have signs of a serious allergic reaction (such as rash, swelling, or trouble breathing) or symptoms of liver trouble.

There is no well-established stand-alone dose for Clown's Mustard Plant. In practice, it is almost always taken as part of a standardized liquid combination product, where the dose is set by the manufacturer.

If you use a product containing this herb, follow the directions on the label and do not exceed the recommended amount. Because formulas and concentrations vary, ask your pharmacist to help you understand the correct dose and whether the product is right for you.