Isopulegol is a terpene naturally found in plants such as mint, geranium, lemongrass, and cannabis. Because of its unique aroma, flavor, and effect profile, it's often used as an additive in consumer goods and scented personal care products.
Isopulegol is a cyclic monoterpene with the molecular formula C10H18O. It has four stereoisomers: cis- and trans-isopulegol, and cis- and trans-p-menth-8-en-3-ol. Isopulegol is a colorless liquid with a boiling point of 216°C and a melting point of 80°C. It is soluble in ethanol and ether but insoluble in water. It can be synthesized from citronellal or extracted from plant-based essential oils (EOs).
Aside from its natural appeal as an additive to bath products and food items, some studies suggest that isopulegol may possess antioxidant properties, antiviral properties, and a range of other therapeutic benefits.
This primer covers everything you need to know about this terpene, from its potential benefits and applications to the best cannabis strains with high concentrations of isopulegol.
Botanical Sources of Isopulegol
Isopulegol is surprisingly scarce in nature and is most commonly prepared synthetically from citronellal, a more common terpene. However, there are a few reliable sources of isopulegol for those who prefer organically-derived terpenes.
Some notable botanical sources include:
- Peppermint contains about 3-6% isopulegol, a menthol chemical precursor. As of this writing, the most popular method of organically procuring and isolating isopulegol involves freezing peppermint oil. It has a cooling and refreshing effect on the skin and the respiratory system, with potential health benefits such as relieving headaches, nausea, indigestion, and pain.
- Lemongrass contains about 4-6% isopulegol, the source of its lemony and minty flavors. Lemongrass is known in Eastern cultures for its antibacterial, anti-inflammatory, and antioxidant properties. When prepared in Asian cuisine, it's believed to help fight viral infections, reduce fever, lower blood pressure and improve digestion.
- Lemon balm contains about 3-11% isopulegol, contributing to its calming and soothing effects. Lemon balm has been used for centuries as a natural remedy for anxiety, insomnia, stress, and depression. It can also improve cognitive function, memory, and mood.
- Geranium contains about 1-3% isopulegol, which adds to its floral and citrusy fragrance. Geranium has been used in traditional Moroccan medicine as a binding for wounds, an anti-inflammatory agent, and a gastrointestinal protectant. It can also repel insects, balance hormones, and promote skin health.
What Does Isopulegol Terpene Smell (and Taste) Like?
Isopulegol smells and tastes like fresh peppermint, with a hint of citrus and floral notes. It can also have a slightly spicy or woody undertone, depending on the plant or product it's derived from. Isopulegol is largely perceived as one of the most pleasant and refreshing terpenes thanks to its potent minty aroma and flavor profile, with the ability to stimulate the senses and invigorate the mind.
Potential Health Benefits of Isopulegol
Apart from its cosmetic uses, isopulegol also has potential health benefits that have been explored in scientific literature. It's worth noting that most of the studies around these benefits are based on animal models, and researchers concluded that further testing is needed to confirm its effects on humans.
Isopulegol has demonstrated a protective effect against seizures and convulsions in multiple studies. This may be due to its ability to modulate the GABA-A receptor, which regulates brain activity, stress, and mood. This modulation of GABA-A is likely the central factor in isopulegol's ability to control anxiety levels in mice.
A 2020 study from Brazil's Regional University of Cariri highlighted isopulegol's ability to reduce acute and chronic inflammation via its modulation of histamine and prostaglandin pathways involved in irritant and erythrogenic responses. This modulatory effect on inflammatory mediators can also prevent the formation of ulcers in the stomach and intestines.
If you aren't impressed yet, isopulegol has also been shown to have antiviral effects against the influenza virus strains H1N1 and H1N2 in vitro. This may be due to its ability to interfere with the virus's early stages of infection.
Contemporary Uses of Isopulegol in Consumer Products
While isopulegol may have drawn the interest of researchers due to its medicinal properties, its pleasant aroma and calming effect profile have also attracted a variety of product manufacturers in different industries.
Isopulegol is often used in cosmetics such as lip balms, creams, lotions, and shampoos. It provides a refreshing and cooling sensation on the skin and hair and has a pleasant minty fragrance.
Isopulegol is used in beauty products such as nail polish, deodorants, and perfumes. It enhances aroma and flavor, shelf life, and stability. It's popular in scented personal care products such as soap, toothpaste, mouthwash, and chewing gum. It gives these products a fresh and clean scent and taste and a soothing antiseptic effect on the oral cavity.
Like other terpenes, isopulegol is also used in aromatherapy via an essential oil diffuser or infused items like candles. It has a calming and relaxing effect on the mind and body and potential anti-inflammatory and antiviral effects on the respiratory system.
3 Cannabis Strains With Good Concentrations of Isopulegol
Isopulegol is a terpene present in a surprising number of highly popular cannabis strains. Let's look at three examples below.
Kosher Tangie
Kosher Tangie is a delightful blend of Kosher Kush and Tangie strains, resulting in a truly unique and flavorful experience. With THC levels ranging from moderate to high, Kosher Tangie offers a potent and uplifting high, perfect for recreational and medicinal users.
The aroma of Kosher Tangie is a delightful fusion of sweet citrus and earthy undertones, creating an enticing sensory experience. Known for its ability to induce creativity, euphoria, and relaxation, this strain is highly regarded among cannabis enthusiasts.
OG Kush
OG Kush is an iconic cannabis strain known for its strong and distinct aroma. It offers a complex blend of earthy, pine, and citrus notes, creating a sensory experience like few other indica-dominant hybrids.
OG Kush boasts potent THC levels, delivering a long-lasting and deeply relaxing high. It's highly sought after for its ability to induce a blissful state of euphoria while simultaneously easing stress and tension.
With its reputation for delivering a balanced combination of physical and mental effects, OG Kush loved by both recreational and medicinal users alike.
Headband
Headband is a cross between the renowned OG Kush and Sour Diesel strains, resulting in a remarkable combination of genetics. True to its name, Headband is known for its cerebral effect profile that creates a gentle pressure around the temples, reminiscent of wearing a headband. The high THC content in Headband offers a powerful and long-lasting experience, leaving users feeling uplifted, euphoric, and mentally stimulated.
The aroma of Headband is often described as a delightful blend of diesel, earthy undertones, and hints of citrus, creating an enticing olfactory experience. Headband's unique combination of effects and its appealing flavor profile have made it a favorite among cannabis consumers of all levels.
3 Essential Oils High in Isopulegol
If you're looking to access the therapeutic potential of isopulegol without the psychoactivity of cannabis, we've got you covered.
Here's a short list of EOs containing significant amounts of isopulegol, listed in order of highest to lowest concentration:
Peppermint Essential Oil (8-30%)
Peppermint (Mentha piperita) essential oil is widely recognized among product manufacturers and DIYers as the single most reliable botanical source of isopulegol. It also contains other constituents such as menthol, menthone, and menthyl acetate, contributing to its overall aroma and therapeutic properties.
Eucalyptus Essential Oil (1-20%)
Eucalyptus (Eucalyptus globulus) essential oil is another prominent source of isopulegol. While it may not contain as high a concentration as peppermint, it's one of the most commonly used EOs for accessing the terpenes cineol (i.e. eucalyptol) and isopulegol.
Spearmint Essential Oil (0.6-5%)
Spearmint (Mentha spicata) essential oil is also known to contain isopulegol, although in markedly lower concentrations than peppermint oil. Still, it's a popular choice for infusing aromatherapy products like bath bombs due to its refreshing scent and potential health benefits.
It's important to remember that concentrations of isopulegol can vary depending on factors such as plant species, growing conditions, and extraction methods used to create specific EOs. It's always recommended to consult reliable sources (or the EO manufacturers themselves) to obtain the most accurate information on average isopulegol content in EOs.
Potential Side Effects & Precautions Around Isopulegol
While isopulegol is generally considered safe, it's essential to be aware of potential side effects and take the necessary precautions. High concentrations of isopulegol can irritate the skin, eyes, and mucous membranes. In some individuals, it may trigger allergic reactions or respiratory issues.
When using EOs containing high levels of isopulegol, it's crucial to perform a patch test and dilute it properly before topical use. It may also interact with other terpenes, cannabinoids, and medications, so it is advisable to consult a doctor before using it for medical purposes.
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