Wormwood (high thujone)

Medically reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD — GMJ Editorial Board

What is Wormwood (high thujone)?

Wormwood (Artemisia absinthium) is a bitter perennial herb native to Europe, Asia, and North Africa, known for its silvery-green foliage and distinctive aromatic properties. The plant contains various bioactive compounds, most notably thujone, a monoterpene ketone that gives wormwood its characteristic bitter taste and potential therapeutic effects. High-thujone wormwood extracts are concentrated preparations that contain elevated levels of this compound, typically ranging from 35-45% thujone content.

Historically, wormwood has been used in traditional medicine for digestive ailments and as a key ingredient in absinthe, the infamous green liqueur. The herb belongs to the Asteraceae family and has been utilized for centuries across various cultures for its purported medicinal properties, though its high thujone content has raised safety concerns in modern times.

Health benefits & uses

Limited evidence supports several traditional uses of wormwood, though most research has been conducted in laboratory settings or small-scale studies:

Submit Your Paper

Digestive support: Wormwood has traditionally been used to stimulate appetite and aid digestion due to its bitter compounds. Some studies suggest it may help with dyspepsia and gastric discomfort, though clinical evidence remains limited.

Antimicrobial activity: Laboratory studies indicate that wormwood extracts may possess antibacterial and antifungal properties, potentially useful against certain pathogens. However, human clinical trials are lacking.

Anti-inflammatory effects: Preliminary research suggests wormwood may have anti-inflammatory properties, though this has not been extensively studied in humans.

Parasite treatment: Traditional use includes treatment of intestinal parasites, but modern evidence is insufficient to support this application safely.

How it works

Thujone, the primary active compound in high-thujone wormwood, interacts with the central nervous system by modulating gamma-aminobutyric acid (GABA) receptors. This interaction can produce both stimulatory and inhibitory effects depending on the dose. The bitter compounds in wormwood, including absinthin and anabsinthin, stimulate taste receptors that trigger digestive enzyme production and gastric acid secretion.

The herb’s antimicrobial effects are attributed to its essential oils and sesquiterpene lactones, which may disrupt microbial cell membranes. However, the same mechanisms that produce therapeutic effects also contribute to wormwood’s potential toxicity, particularly at higher doses.

Dosage

Due to safety concerns with high-thujone wormwood, there are no established recommended daily allowances (RDA) or tolerable upper limits (UL). Traditional dosing has varied widely, but modern recommendations emphasize extreme caution:

Traditional dried herb: 0.5-2 grams daily for short periods (typically 2-4 weeks maximum)

Standardized extracts: Should only be used under professional supervision

Duration: Short-term use only (generally not exceeding 4 weeks)

The European Food Safety Authority has established limits for thujone content in foods and beverages, with maximum levels of 0.5 mg/kg in foods and 10 mg/kg in alcoholic beverages. Professional guidance is essential for any therapeutic use of high-thujone wormwood preparations.

Food sources

Wormwood is not commonly consumed as a food source due to its intense bitterness and potential toxicity. The primary dietary exposure occurs through:

Alcoholic beverages: Absinthe and certain vermouths contain wormwood extracts, though commercial products are regulated for thujone content

Herbal teas: Some traditional herbal blends may contain small amounts of wormwood

Herbal supplements: Available as capsules, tinctures, and dried herb preparations

Traditional medicine preparations: Used in various folk remedies and herbal formulations

Natural dietary sources of thujone are limited, with sage and tansy being other plants that contain this compound in smaller quantities.

Safety & side effects

High-thujone wormwood carries significant safety concerns and can cause serious adverse effects, particularly with prolonged use or high doses:

Neurological effects: Seizures, hallucinations, anxiety, insomnia, and tremors

Gastrointestinal issues: Nausea, vomiting, diarrhea, and stomach cramps

Kidney problems: Potential kidney damage with chronic use

Absinthism: A condition historically associated with chronic absinthe consumption, characterized by addiction, hyperexcitability, and hallucinations

The FDA has banned wormwood as a food additive due to thujone’s neurotoxic potential. Symptoms of thujone toxicity can occur at relatively low doses, making high-thujone preparations particularly risky.

Interactions

Anticonvulsant medications: Wormwood may reduce the effectiveness of seizure medications and potentially trigger seizures

CNS depressants: May interact with alcohol, benzodiazepines, and other central nervous system depressants

Blood-thinning medications: Potential interaction with warfarin and other anticoagulants

Diabetes medications: May affect blood sugar levels and interact with antidiabetic drugs

Other herbal supplements: Should not be combined with other herbs containing thujone or neurotoxic compounds

Who should be cautious

Certain populations should completely avoid high-thujone wormwood:

Pregnant and breastfeeding women: Risk of uterine contractions and potential harm to the developing fetus

Children: Higher susceptibility to thujone toxicity

Individuals with seizure disorders: Thujone can lower seizure threshold

People with kidney or liver disease: Increased risk of organ damage

Those with mental health conditions: May exacerbate anxiety, depression, or psychotic disorders

Individuals taking multiple medications: High potential for interactions

Frequently asked questions

Is high-thujone wormwood legal to purchase?

The legal status varies by country and intended use. In the United States, high-thujone wormwood is banned as a food additive but may be available as an herbal supplement. Many countries strictly regulate thujone content in commercial products.

How does high-thujone wormwood differ from regular wormwood?

High-thujone wormwood contains concentrated levels of thujone (35-45%), while regular wormwood preparations typically contain much lower amounts. The higher concentration increases both potential effects and toxicity risks.

Can I use wormwood for parasites like I’ve read online?

While traditional medicine has used wormwood for parasites, modern evidence doesn’t support its safety or effectiveness for this purpose. Proven antiparasitic medications are safer and more effective options that should be used under medical supervision.

How long does thujone stay in the body?

Thujone is metabolized relatively quickly by the liver, typically within 24-48 hours. However, with repeated use, metabolites may accumulate, potentially leading to toxicity even with seemingly moderate doses.

Are there safer alternatives to high-thujone wormwood?

For digestive support, gentian root, dandelion, or artichoke leaf offer similar bitter properties without thujone’s risks. For any specific health concerns, consult with a healthcare provider about safer, evidence-based alternatives.