Beta-Thujone

What is Beta-Thujone

Beta-Thujone is a naturally occurring organic compound from the group of monoterpene ketones. It is found in the essential oils of various plants, particularly in mugwort (Artemisia spp.), wormwood (Artemisia absinthium), Thuja species (arborvitae) and sage (Salvia officinalis). Together with its isomeric counterpart Alpha-Thujone, Beta-Thujone is largely responsible for the characteristic aroma of many bitter medicinal and culinary herbs.

From a chemical perspective, Beta-Thujone differs only slightly from Alpha-Thujone – the two forms are stereoisomers, meaning they differ in the spatial arrangement of their molecular structure. However, this small difference can be decisive for their biological activity. In the past, Beta-Thujone became known particularly in connection with the alcoholic beverage absinthe, as it was suspected of being one of its psychoactive agents. Today, Thujone – especially in high doses – is strictly regulated. The substance is at the center of numerous toxicological assessments, as it can have neurotoxic effects in case of overdose. Nevertheless, Beta-Thujone in small amounts, as a component of essential oils, is still used today in naturopathy, aromatherapy, and the perfume industry.

What benefits does Beta-Thujone offer for health?

The use of thujone-containing plants in traditional medicine has been documented over many centuries. Research on isolated Beta-Thujone is still at a relatively early stage but points to some interesting properties – provided the dosage remains within a safe range. The effects studied include:

  • Antimicrobial effects: In laboratory studies, thujone-containing essential oils showed an inhibitory effect on various bacteria and fungi (1,2,3).
  • Insect-repellent properties: In certain concentrations, Beta-Thujone acts as a natural agent against insects (4,5).

As mentioned, far more research is necessary before conclusive statements can be made about its effects, so we will have to wait and see what the future holds to understand the full potential of Beta-Thujone.

How does Beta-Thujone work in the body?

Beta-Thujone influences the central nervous system by interacting with GABA receptors – in particular, it acts as a GABA antagonist (6).

Are there risks or side effects?

  • Neurotoxicity in case of overdose: Above a certain dose, Beta-Thujone can have neurotoxic effects – it can lead to seizures, hallucinations, or even impaired consciousness (7).
  • Regulated amounts in foods: Because of these effects, the EU has established maximum levels for thujone in foods and dietary supplements (e.g., max. 10 mg/kg in alcoholic beverages containing herbs) (4).
  • Not suitable for pregnant women or epileptics: Due to the possible influence on the central nervous system, pregnant women, breastfeeding mothers, and individuals with neurological conditions should avoid thujone-containing products.

Conclusion

Beta-Thujone is a complex natural compound with interesting biological properties but also potential risks. In very small doses – as found in controlled amounts of essential oils – the compound is used in traditional applications. However, any therapeutic use should always be approached with caution and with knowledge of possible side effects. In addition, a physician should be consulted, and self-medication should be avoided.

Sources:

  1. Mighri, H., Hajlaoui, H., Akrout, A., Najjaa, H., & Neffati, M. (2010). Antimicrobial and antioxidant activities of Artemisia herba-alba essential oil cultivated in Tunisian arid zone. Comptes Rendus Chimie, 13(3), 380–386. https://doi.org/10.1016/j.crci.2009.09.008
  2. Juteau, F., Jerkovic, I., Masotti, V., Milos, M., Mastelic, J., Bessière, J. M., & Viano, J. (2003). Composition and antimicrobial activity of the essential oil of Artemisia absinthium from Croatia and France. Planta medica, 69(2), 158–161. https://doi.org/10.1055/s-2003-37714
  3. Zámboriné Németh, É., Thi Nguyen, H. Thujone, a widely debated volatile compound: What do we know about it?. Phytochem Rev 19, 405–423 (2020). https://doi.org/10.1007/s11101-020-09671-y
  4. Xie, F., Rizvi, S.A.H. & Zeng, X. Fumigant toxicity and biochemical properties of (α + β) thujone and 1,8-cineole derived from Seriphidium brevifolium volatile oil against the red imported fire ant Solenopsis invicta (Hymenoptera: Formicidae). Rev. Bras. Farmacogn. 29, 720–727 (2019). https://doi.org/10.1016/j.bjp.2019.04.013
  5. Wróblewska-Kurdyk, A., Gniłka, R., Dancewicz, K., Grudniewska, A., Wawrzeńczyk, C., & Gabryś, B. (2019). β-Thujone and Its Derivatives Modify the Probing Behavior of the Peach Potato Aphid. Molecules (Basel, Switzerland), 24(10), 1847. https://doi.org/10.3390/molecules24101847
  6. Rivera, E. M., Cid, M. P., Zunino, P., Baiardi, G., & Salvatierra, N. A. (2014). Central α- and β-thujone: similar anxiogenic-like effects and differential modulation on GABAA receptors in neonatal chicks. Brain research, 1555, 28–35. https://doi.org/10.1016/j.brainres.2014.01.039
  7. Pelkonen, O., Abass, K., & Wiesner, J. (2013). Thujone and thujone-containing herbal medicinal and botanical products: toxicological assessment. Regulatory toxicology and pharmacology : RTP, 65(1), 100–107. https://doi.org/10.1016/j.yrtph.2012.11.002