Do you enjoy the minty sensation in beverages? Or the sharp sensation and aroma of inhalers used to relieve dizziness or headaches? You are also probably familiar with the minty freshness found in toothpaste and mouthwash. That refreshing sensation most likely comes from a compound called menthol, which can be obtained from mint plants. Menthol offers a wide range of benefits, both those already being applied today and those that remain potential applications requiring further research and development before they can be put into practice. Let’s explore this fascinating compound!
Compound Characteristics, Sources, and Extraction
Menthol is a monocyclic monoterpene compound with the chemical formula C₁₀H₂₀O and the IUPAC name 2-isopropyl-5-methylcyclohexanol [1,2]. In nature, menthol is predominantly found in the form of (−)-menthol. However, because it contains three asymmetrically substituted carbon atoms, menthol has eight possible stereoisomers: (+)- and (−)-menthol, (+)- and (−)-isomenthol, (+)- and (−)-neomenthol, and (+)- and (−)-neoisomenthol [2,3].
At cool room temperatures, menthol occurs as a white or colorless solid, often in the form of crystalline flakes. It is practically insoluble in water but freely soluble in ethanol, diethyl ether, and chloroform [3].
Menthol can be found in various plants belonging to the genus Mentha, particularly peppermint, as a constituent of its essential oil, commonly known as peppermint essential oil (PEO). In addition to menthol, other important compounds found in PEO include menthone, neomenthol, isomenthone, and many others. Menthol, together with several of these compounds, contributes to the distinctive fresh, minty aroma of peppermint plants [4].
Menthol can be obtained through a series of processes, beginning with the extraction of PEO from Mentha plants using various methods, such as distillation, microwave-assisted extraction, supercritical fluid extraction, and ultrasound-assisted extraction. This is followed by the isolation of menthol from the other components of PEO [4].
Applications and Biological Activities
Peppermint (Mentha × piperita L.), one of the primary plant sources of menthol, has also been used in ethnomedicine in various parts of the world. The most commonly used parts are the aerial portions and leaves [5]. One traditional application involves using peppermint leaves as a decoction to manage gastrointestinal colic [6]. In addition to the leaves, the essential oil obtained from peppermint leaves has also been traditionally used to address menstrual cramps, rheumatism, and muscle pain [5].
Meanwhile, menthol's cooling effect and refreshing aroma have made it a widely used additive in various healthcare and household products. Menthol is known to act as an agonist of transient receptor potential melastatin 8 (TRPM8), a receptor found in the epithelium that also functions as a cold receptor. When activated, TRPM8 produces a cooling sensation on the skin and mucous membranes. This mechanism accounts for menthol's characteristic cooling effect [3].
In addition, menthol has been reported to exhibit several biological activities, including anti-inflammatory, antibacterial, analgesic, antipruritic, anticancer, and antifungal effects [3].
Anti-inflammatory Effects
The anti-inflammatory activity of menthol has been evaluated through both in vitro and in vivo studies. Its anti-inflammatory effects are known to involve several mechanisms, one of which is the reduction of inflammation through cation signaling pathways, whereby menthol can inhibit the release of pro-inflammatory cytokines. In addition, the interaction between menthol and TRPM8 has been reported to mitigate inflammation following myocardial infarction. Menthol has also been found to modulate inflammation associated with gastroesophageal reflux through its interaction with TRPV1 receptors in esophageal epithelial tissue [7].
Antioxidant and Cytoprotective Effects
Menthol is known to act as a free radical scavenger and enhance endogenous antioxidant responses. It may increase the production and functional capacity of several antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) [7]. However, these effects are highly dependent on the dose of menthol used.
Antibacterial, Antifungal, and Antiviral Effects
Most studies investigating the antibacterial activity of menthol have been conducted in vitro, showing that menthol can interact with microbial cell membranes. Menthol can also integrate into the lipid bilayer of bacterial membranes, thereby affecting their permeability. Regarding its antifungal activity, menthol is known to target H⁺-ATPase in fungal membranes. Meanwhile, menthol-rich essential oils have been observed to disrupt viral envelopes, inhibit viral adsorption, and interfere with membrane fusion processes [7].
Analgesic Activity
Another potential application of menthol is its analgesic activity. This potential is partly attributed to its role in activating TRPM8. Nevertheless, other mechanisms may also be involved, including interactions between menthol and the broader transient receptor potential (TRP) channel family, which warrant further investigation to support the development of menthol-based analgesic applications [8].
Conclusion
Menthol is more than just a compound that provides a cooling sensation and minty aroma; it is also a bioactive compound with broad and promising pharmacological potential. Although its benefits have been widely utilized, further research is still needed to establish its efficacy, safety, and optimal therapeutic applications in the future.
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Referensi
[1] Zhang, J., Hu, Y., & Wang, Z. (2025). Menthol and its Derivatives: Exploring the medical application potential. Engineering in Life Sciences, 25(9), e70039. https://doi.org/10.1002/elsc.70039
[2] Mansurov, D. A., Khaitbaev, A. K., Khaitbaev, K. K., Toshov, K. S., & Benassi, E. (2025). Relationship between structural properties and biological activity of (-)-menthol and some menthyl esters. Computational Biology and Chemistry, 115, 108357. https://doi.org/10.1016/j.compbiolchem.2025.108357
[3] Cheng, H., & An, X. (2022). Cold stimuli, hot topic: An updated review on the biological activity of menthol in relation to inflammation. Frontiers in Immunology, 13, 1023746. https://doi.org/10.3389/fimmu.2022.1023746
[4] Zhao, H., Ren, S., Yang, H., Tang, S., Guo, C., Liu, M., Tao, Q., Ming, T., & Xu, H. (2022). Peppermint essential oil: its phytochemistry, biological activity, pharmacological effect and application. Biomedicine & Pharmacotherapy, 154, 113559. https://doi.org/10.1016/j.biopha.2022.113559
[5] Mahendran, G., & Rahman, L. (2020). Ethnomedicinal, phytochemical and pharmacological updates on Peppermint (Mentha × piperita L.)—A review. Phytotherapy Research, 34(9), 2088–2139. Portico. https://doi.org/10.1002/ptr.6664
[6] Abou Zid, S. F., & Mohamed, A. A. (2011). Survey on medicinal plants and spices used in Beni-Sueif, Upper Egypt. Journal of Ethnobiology and Ethnomedicine, 7, 18.
[7] Baser, K. H. C., Erdag, E., & Haskologlu, I. C. (2025b). Menthol: A Comprehensive review of its pharmacological properties and therapeutic applications. Natural Product Communications, 20(11). https://doi.org/10.1177/1934578x251395909
[8] Li, Z., Zhang, H., Wang, Y., Li, Y., Li, Q., & Zhang, L. (2022). The distinctive role of menthol in pain and analgesia: Mechanisms, practices, and advances. Frontiers in Molecular Neuroscience, 15, 1006908. https://doi.org/10.3389/fnmol.2022.1006908
Editorial Team:
- Rafi Rif'atul Rizki, S.I.Kom.