Side Effects of Black Walnut Wormwood Complex

Black walnut and wormwood complex is an herbal remedy used to ease gastrointestinal complaints and expel intestinal parasites. Like most herbal supplements, black walnut and wormwood complex has not been evaluated for human safety by the FDA. Preparations of these herbs can contain inconsistent amounts of the active ingredients, and other contaminants might be present. Contact a doctor if you suspect you are having an adverse reaction to this supplement.

Wormwood leaves
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Gastrointestinal Discomfort

The tannins in black walnut can cause nausea and upper abdominal pain, especially if you take it for a long time or you take doses larger than recommended on the product label. Wormwood might also cause nausea, vomiting or abdominal cramps if it is used for a long time. Neither of these herbs should be used by people with liver or kidney problems, or by people with stomach ulcers. Damage to the liver and kidneys is possible if you use them for more than a month, and they can aggravate existing stomach problems.


Black walnut might cause allergic reactions in some people, particularly those allergic to other types of nuts. Allergic reactions to black walnut include difficulty breathing, chest pain and hives. Wormwood can cause similar allergic reactions in people who are sensitive to daisies and ragweed.

Pregnant and Lactating Women

If you are pregnant, may be pregnant or are trying to get pregnant, do not take black walnut and wormwood complex for any reason. The effects of these herbs on a developing fetus are not well-documented and could harm the baby. Avoid this complex if you are breastfeeding since it is not well-known if the herbal compound can pass to the baby through your breast milk. Black walnut and wormwood complex should never be given to children under 2 years of age.

Wormwood Side Effects

Wormwood contains thujone, a powerful convulsant when used in large amounts. Thujone is the ingredient in absinthe believed to have neurotoxic effects with long-term use, including addiction, seizures, hallucinations and possible death from renal or liver failure. People with seizure disorders in particular should avoid using any supplement that contains wormwood.

Interactions With Medications

Both black walnut and wormwood can interfere with other medications and prevent them from entering your bloodstream. Drugs that might become ineffective with this complex include acetaminophen, antacids and proton pump inhibitors. If you use phenobarbital to prevent seizures, wormwood can weaken the drug and make seizures more likely.

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