Absinthin (Wormwood Dimeric Sesquiterpene Lactone · Most Bitter Natural Compound · Digestive Bitter)

Compound	Absinthin
Chemical class	Terpenoid — Sesquiterpene Lactone (Guaianolide dimeric sesquiterpene lactone; most bitter natural compound)
CAS	1362-42-1
Primary source	Artemisia absinthium (wormwood, aerial parts)
Key applications	Most intensely bitter compound known; digestive/carminative bitter; antiparasitic; antifeedant
Claim strength	Moderate (bitters/digestive); Emerging (antiparasitic preclinical)
Typical form	Wormwood extract; absinthium tincture; component of bitters (Angostura, Campari, absinthe aperitif)
Buy from Herbuno	Request availability and bulk pricing →

Name origin: From Artemisia absinthium (wormwood; absinthium from Greek apsinthion = wormwood). Absinthin is a dimeric guaianolide sesquiterpene lactone — two guaianolide units linked through a unique dihydrofuran ring, a rare structural motif. It is considered one of the most intensely bitter compounds known — detectable by taste at approximately 1 part per million (0.0001%). The extreme bitterness is the basis for wormwood’s digestive applications and has made it a defining ingredient of bitter digestive liqueurs. Wormwood vs sweet wormwood note: Artemisia absinthium (wormwood, bitter wormwood) must not be confused with Artemisia annua (sweet wormwood, qing hao) which contains artemisinin (built SM13). The two are related botanically (Artemisia genus) but have different alkaloid profiles and pharmacology. The Herbuno catalogue includes Artemisia annua extract (artemisinin source) but not A. absinthium directly — hence absinthin is available on request from Herbuno. Traditional use: Wormwood has been used in European, Middle Eastern, and North African traditional medicine since at least 1550 BCE (referenced in Ebers Papyrus) for digestive complaints, intestinal parasites (especially Ascaris), and as a bitter tonic. It is the defining ingredient of absinthe (the “green fairy” liqueur), which also historically contained thujone — a toxic monoterpene from Artemisia responsible for historical absinthe-related neurotoxicity (the thujone content of modern regulated absinthe is strictly limited). Absinthin itself is not psychoactive or neurotoxic. Commercial source: Not currently in the Herbuno catalogue. Contact Herbuno for wormwood extract availability.

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Evidence for Absinthin Applications

Bitter digestive (TAS2R activation): Absinthin activates bitter taste receptors (particularly TAS2R10 and TAS2R14) in the GI tract at extremely low concentrations due to its exceptional bitterness. GI bitter receptor activation stimulates gastric acid secretion, digestive enzyme release, bile flow, and gut motility — the mechanism underlying all traditional uses of wormwood as a digestive bitter tonic. European phytomedicine tradition (Commission E, ESCOP) recognises wormwood for “loss of appetite and dyspeptic complaints” based on traditional use. Claim strength: Moderate (traditional; mechanism established).

Antiparasitic — traditional and preclinical: Wormwood preparations have been used for intestinal parasites (roundworms, pinworms, threadworms) since antiquity. Absinthin and related sesquiterpene lactones have demonstrated antiparasitic activity against Ascaris, Trichinella, and Giardia in animal and cell models. The clinical evidence for wormwood as a modern antiparasitic is limited — modern anthelmintics (albendazole, mebendazole) are far more effective and specific. Claim strength: Moderate (traditional; animal; limited clinical).

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Frequently Asked Questions — Absinthin

Is absinthin the compound that made absinthe dangerous?
No — the historical neurotoxicity attributed to absinthe was primarily from thujone (α-thujone and β-thujone), monoterpene ketones from Artemisia absinthium essential oil that are GABA-A receptor antagonists (convulsant at high doses). Historical absinthe also contained extremely high alcohol content (60–80% ethanol) and potentially toxic adulterants (copper sulfate used as a colourant). Absinthin is the bitter sesquiterpene lactone — extremely bitter but not neurotoxic. Modern absinthes are regulated to limit thujone content (EU: <35 ppm in spirits, <0.5 mg/kg in food). The “absinthe madness” was largely chronic alcoholism from the high ethanol content, not thujone-specific toxicity.

What is the threshold concentration for human bitterness detection of absinthin?
Absinthin is detectable by human bitterness perception at approximately 0.07 ppm (70 ppb) — making it one of the most bitter substances known. For comparison: quinine (another intensely bitter compound) is detectable at approximately 0.08 ppm; gentiopicroside (gentian) at approximately 0.12 ppm; caffeine at approximately 7 ppm. Absinthin’s exceptional bitterness means that trace amounts in commercial bitters, aperitifs, and digestive preparations provide the characteristic intense bitter flavour perceived even after extensive dilution with other ingredients.

Is Artemisia absinthium safe for internal use?
At the doses used in traditional bitters and Commission E-approved preparations (<3 g dried herb/day), A. absinthium is considered safe for short-term use in otherwise healthy adults. The thujone content (the toxic monoterpene) must be controlled — EU regulations limit thujone in food and beverage products. Contraindications: pregnancy (uterotonic activity — wormwood has been used historically as an abortifacient), bile duct obstruction, peptic ulcers (bitter stimulation of gastric acid inappropriate). Not for long-term continuous use (traditionally used in 3–4-week courses).

Why is Artemisia absinthium different from Artemisia annua?
Both are in the genus Artemisia but are distinct species with different chemical profiles. A. absinthium (wormwood) contains absinthin, artabsin, and thujone as primary actives. A. annua (sweet wormwood, qing hao) contains artemisinin as the primary active — the antimalarial sesquiterpene lactone with no bitterness and no thujone. The two species are not interchangeable. “Wormwood” in antiparasitic and bitter contexts refers to A. absinthium; “sweet wormwood” in antimalarial contexts refers to A. annua.

Related compounds: Artabsin, Artemisinin, Parthenolide, Zerumbone

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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