Mentha haplocalyx Briq. (Chinese Field Mint / Bo He): A Comprehensive Reference
1. Identity
1.1 Botanical and Chemical Names
Mentha haplocalyx Briq. is a notable member of the Lamiaceae (mint) family. It is also formally recognized as Mentha canadensis L., a perennial herbaceous plant of the family Lamiaceae that is widely distributed in southwest China and popularly used in food, cosmetics, and medicines. The plant is known in Chinese as Bo He (薄荷), and the dried aerial parts (stem and leaf) are referred to pharmacognostically as Menthae Haplocalycis Herba — a popular traditional Chinese medicine (TCM) that has been officially documented in the Chinese Pharmacopoeia named "Bo He" and used as a Chinese edible herb.
As one of the earliest introduced and cultivated plants in China, M. haplocalyx enjoys broad distribution and a long-standing history of medicinal use, earning its inclusion in the Chinese Pharmacopoeia 2020 (Ch.P 2020).
1.2 Common Names and Synonymy
The plant carries several vernacular names: botanically Mentha haplocalyx Briq. (Fam. Lamiaceae), it is referred to in English as Mentha, Peppermint, Cornmint, and Field Mint. It first appeared in Tang Ben Cao in 659 AD as a recognized medicinal material. The synonymy between Mentha haplocalyx Briq. and Mentha canadensis L. is well-established in the scientific literature, and both names are used interchangeably across research publications.
1.3 Botanical Morphology
A member of the family Lamiaceae, M. haplocalyx is a perennial, rhizomatous herb, 80 to 130 cm tall. The leaves are lanceolate to oval or elliptic, 2 to 7 cm long, 1 to 3 cm wide with a fine tooth margin, with both surfaces bearing dense pubescence along the veins. Flowers form with several bracts on a common stem, with a five-lobed calyx tube campanulate and a mauve or white five-lobed corolla. The fruit is a brown nutlet, fruiting in China in October–November. It is found in wetlands throughout China.
1.4 Geographic Distribution and Cultivation
Mentha haplocalyx is an edible plant and important aromatic herb that distributes widely in China; its artificial cultivation is mainly concentrated in Jiangsu and Anhui provinces. Mentha from Anhui province is generally accepted as the genuine medicinal material (Daodi Yaocai in Chinese) with stable quality and good clinical efficacy. The species has strong adaptability and often grows beside rivers in mountainous wetlands below 2,100 meters above sea level. It is mainly distributed in China, South Korea, Japan, and North America.
1.5 Common Preparations and Dosage Forms
The entire plant, including leaves, is gathered in any season. The leaves can be picked two or three times each year, dried in a shady place and then cut into pieces. The leaves of M. haplocalyx are also used in teas, beverages, jellies, syrups, candies, and other products. Although the genus Mentha comprises more than 20 species, only the fresh aerial part of Mentha haplocalyx Briq. is described and used as a traditional Chinese herb in the Chinese Pharmacopoeia. The essential oil, extracted by hydrodistillation from the aerial parts, is a major commercial product. The current Ch.P 2020 uses menthol content (no less than 0.20%) as the sole indicator for assessing the quality of M. haplocalyx.
2. Traditional and Historical Use
2.1 China and East Asia
The use of a local mint species, Mentha haplocalyx Briq., called "bo he," has long been documented in traditional Chinese medicine. The source of the earliest record is the Xinxiu Bencao, a Tang Dynasty pharmacopeia compiled in 659 AD, making it among the most historically attested medicinal herbs in the Chinese tradition. As one of the earliest introduced and cultivated plants in China, M. haplocalyx enjoys a long-standing history of medicinal use.
In the framework of Traditional Chinese Medicine, the herb is classified as pungent and cool in taste and temperature. It is acrid, aromatic and cooling, and enters the Lung and the Liver channels. Its principal TCM functions are described as: to disperse wind-heat and clear the head and eyes; to promote liver qi, allowing it to flow freely; and to bring rashes to the surface.
Clinically within TCM, M. haplocalyx was applied to a range of conditions. For wind-heat exterior syndrome manifested as fever, headache, mild aversion to wind and cold, sore throat and red eyes, Mentha (Bo He) was used together with Platycodon root (Jiegeng), Arctium fruit (Niubangzi), and Chrysanthemum flower (Juhua). For stagnation of qi in the liver manifested as a full sensation and pain in the chest and costal region, Mentha (Bo He) was used with White peony root (Baishao) and Bupleurum root (Chaihu) in classical formulas such as Xiaoyao San. It was also used at the early stage of measles with slight rash.
As a traditional Chinese medicine, M. haplocalyx is clinically used to treat diseases in the nerve center, breath, procreation and digestive systems. Various parts, including the stems and leaves, have been employed as herbal remedies for wounds, swollen glands, colds, coughs, fevers, indigestion, asthma, and influenza.
2.2 Preparation Methods in Traditional Practice
Bo He is most commonly prepared as a tea or within a traditional decoction. For a simple tea, 3–6 grams of dried Bo He leaves are steeped in hot water for 5–10 minutes. In decoctions, it is often added during the last 5–10 minutes of cooking to preserve its volatile aromatic compounds. It contains a lot of volatile oil and is not suitable for long decoction.
3. Key Constituents and Active Compounds
3.1 Overview of Phytochemical Classes
Extensive research has identified that M. haplocalyx primarily contains terpenoids, flavonoids, phenolic acids, anthraquinones, hydrocarbons, polysaccharides, and other phytochemicals. Among these, volatile compounds like terpenoids are recognized as the primary bioactive constituents. Additionally, M. haplocalyx is a rich source of carbohydrates, dietary fiber, amino acids, minerals, and vitamins, further underscoring its nutritional value.
3.2 Volatile (Terpenoid) Constituents
Among the terpenoids, menthol and menthone are particularly notable. Menthol typically constitutes 62.3–87.2% of M. haplocalyx's volatile components, while menthone accounts for approximately 12%. Notably, menthol serves as the key raw material for M. haplocalyx flavoring.
A focused GC-FID and GC/MS analysis of the essential oil from the aerial parts of M. haplocalyx confirmed these proportions at the individual specimen level: the chemical composition of the essential oil obtained by hydrodistillation was investigated, and 23 components, representing 92.88% of the total oil composition, were identified. The main compounds were menthol (59.71%), menthyl acetate (7.83%), limonene (6.98%), and menthone (4.44%).
One study found that the dominant terpenoid compounds were menthol, menthone, menthyl acetate, and limonene, but genetic studies within China have shown that the terpenoid composition varies greatly according to geographic source. Besides, M. haplocalyx can be categorized into distinct chemotypes: carvone, linalool, menthol, pulegone, piperitenone oxide, and menthone. Results from comprehensive two-dimensional GC/TOFMS showed that there are significant differences in chemical composition of Mentha haplocalyx between Anhui and other geographic areas, especially in the biologically active ingredients isopiperitone, levomenthol, and isomenthone.
3.3 Non-Volatile Phenolic and Flavonoid Constituents
Based on accurate mass measurement, MS/MS fragmentation patterns, and chromatographic behaviors, a total of 64 compounds were unambiguously or tentatively characterized from Menthae Haplocalycis Herba, including 30 flavonoids, 20 phenolic acids, 12 terpenoids, and two phenylpropanoids.
The chemical profile of the phenolic fraction of M. haplocalyx (MHP) analyzed by HPLC-LTQ-Orbitrap MS showed that its main constituents were phenolic acids and flavonoids, including protocatechuic aldehyde, caffeic acid, rosmarinic acid, salvianolic acid B, and diosmin, some of which have been reported to display inhibitory effects on inflammation. Flavonoid linarin is also one of the main constituents of the MHP extract.
Target isolation confirmed the presence of acacetin, rosmarinic acid, and clemastanin A (the last of which was reported for the first time from Menthae Haplocalycis Herba).
3.4 Anthraquinones, Sterols, and Organic Acids
Early chemical studies isolated a range of structurally diverse secondary metabolites: nine compounds were obtained and identified as emodin, chrysophanol, physcione, benzoic acid, trans-cinnamic acid, beta-sitosterol, aloe-emodin, ursolic acid, and daucosterol. Ferulic acid and benzoic acid are aromatic acids, while trans-cinnamic acid and palmitic acid are organic acids also identified in M. haplocalyx. Daucosterol, a natural sterol identified in M. haplocalyx, is notable for its neuroprotective and anti-cancer properties.
3.5 Polysaccharides
Several polysaccharide fractions (MHPs) have been extracted from M. haplocalyx using different solvents including hot water, citric acid, alkaline solution, and saline. The results indicated that extraction solvents had notable effects on the extraction yields, sugar contents, uronic acid contents, sulfate contents, monosaccharide contents, and the antioxidant and hypoglycemic activities of the polysaccharides. Among the fractions studied, MHP-C (extracted using citric acid solvent) exhibited better antioxidant activity and hypoglycemic activity.
4. Mechanisms of Action
4.1 Anti-Inflammatory Mechanisms
Research has investigated the anti-inflammatory effects and potential molecular mechanisms of the phenolic fraction of M. haplocalyx (MHP) and its constituent linarin in lipopolysaccharide (LPS)-induced RAW264.7 cells. Using ELISA and qRT-PCR, the expression of pro-inflammatory mediators and cytokines was measured at the transcriptional and translational levels; Western blot analysis was used to investigate changes in the nuclear factor kappa B (NF-κB), mitogen-activated protein kinase (MAPK), and Akt signaling pathways. The study established that the phenolic fraction and linarin mediate anti-inflammatory effects through inactivation of the NF-κB and MAPK pathways.
M. haplocalyx ethanol extract significantly lessened the severity of airway inflammation by inhibiting the production of immunoglobulin E, IL-4, and IL-6 in bronchoalveolar lavage fluid and lung tissue.
4.2 Alpha-Glucosidase Inhibition
Monoterpene glucosides and ionone glycosides endow this plant with alpha-glucosidase inhibitory activity. Extracts of the aerial parts of M. haplocalyx (M. canadensis) were found to significantly inhibit the activity of alpha-glucosidase with an IC50 value of 21.0 μg/mL. Among the compounds evaluated for alpha-glucosidase inhibitory activity, compound 11 was the most active, with an IC50 value of 83.4 μM.
4.3 Neuroprotective Mechanisms
Linarin, a flavonoid glycoside naturally found in M. haplocalyx, has garnered attention for its diverse biological effects, particularly in inhibiting the progression of neurodegenerative diseases. Evidence suggests that linarin exerts neuroprotective effects, as demonstrated in a study using H2O2-induced oxidative stress in rat hippocampal neurons.
4.4 Menthol and TRPM8 Receptor Activation
Mentha piperita and Mentha haplocalyx are both rich in menthol and menthone, the main bioactive components of peppermint essential oil used for culinary and medicinal products. Menthol is known to act as a selective agonist of the cold-sensing transient receptor potential channel TRPM8, which underlies the characteristic cooling sensation associated with the plant. This receptor-based mechanism accounts for its spasmolytic and cooling properties at the mucosal and gastrointestinal levels, as established in the broader Mentha literature. Menthol content possesses antispasmodic properties that help relax gastrointestinal muscles, potentially relieving stomach pain and bloating.
4.5 Penetration Enhancement by Menthol
Studies have found that menthol crystal can promote the penetration of rhynchophylline, and menthol can promote the penetration of metronidazole. This penetration-enhancing property has implications for topical and transmucosal formulations.
5. Scientific Evidence by Area of Use
5.1 Anti-Inflammatory Effects
Evidence level: Preclinical (in vitro and animal); no published randomized controlled human trials specific to M. haplocalyx were identified.
Pharmacological investigations have shown that anti-inflammation is an essential feature of many Mentha species. A 2017 cell-based study from Beijing University of Chinese Medicine examined the phenolic fraction (MHP) and its key constituent linarin in LPS-stimulated murine macrophage cells (RAW264.7). MHP and linarin did not exhibit toxic effects on RAW264.7 cells at 0–200 μg/mL and 0–20 μM, respectively, and the study demonstrated inhibition of NF-κB and MAPK signaling. Flavonoids and phenolic acids from the aqueous extract of M. haplocalyx have been shown to express high anti-inflammatory activity. These findings are limited to cell-culture systems and do not constitute clinical evidence in humans.
5.2 Respiratory / Anti-Asthmatic Effects
Evidence level: Animal model only (ovalbumin-induced mouse model); no human clinical trials identified.
Mentha haplocalyx Briq. is a commonly used herb in traditional Oriental medicine with a variety of known pharmacological properties; however, neither the protective effects of the Mentha haplocalyx ethanol extract (MH) against inflammation of the airway in an asthmatic model nor the mechanisms involved had previously been reported before a study using an ovalbumin (OVA)-induced mouse model of allergic asthma to investigate whether MH was effective against the disease through regulation of airway inflammation. That study reported suppression of IgE, IL-4, and IL-6 in bronchoalveolar lavage fluid, but as an animal study it cannot be directly extrapolated to human efficacy.
5.3 Hypoglycemic / Anti-Diabetic Effects
Evidence level: In vitro and preclinical; no human clinical trials for M. haplocalyx specifically identified.
Several findings have depicted the potential antidiabetic capability of the genus Mentha. Extracts of the aerial parts of M. haplocalyx (M. canadensis) significantly inhibit the activity of alpha-glucosidase with an IC50 value of 21.0 μg/mL, suggesting post-prandial glucose-lowering potential via delayed carbohydrate digestion. Furthermore, extraction studies on polysaccharides from M. haplocalyx showed that different solvent extractions yielded fractions with variable antioxidant and hypoglycemic activities. All available evidence remains at the in vitro or preclinical level.
5.4 Antioxidant Effects
Evidence level: In vitro and preclinical; robust human clinical evidence is lacking.
Chinese peppermint (Mentha haplocalyx) essential oil has antibacterial activity and antioxidant activity, as noted in the Pharmacopoeia of People's Republic of China (2015). Polysaccharide fractions, flavonoids such as linarin and rosmarinic acid, and the phenolic acids in M. haplocalyx all contribute to its in vitro antioxidant profile. These results are well-replicated in cell-based systems but have not been evaluated in published human trials.
5.5 Neuroprotective Effects
Evidence level: Cell-based only.
Linarin, a flavonoid glycoside naturally found in M. haplocalyx, has garnered attention for its diverse biological effects, particularly in inhibiting the progression of neurodegenerative diseases. Evidence suggests that linarin exerts neuroprotective effects, as demonstrated in a study using H2O2-induced oxidative stress in rat hippocampal neurons. The oxidative stress model was effectively established by treating cells with 400 μM H2O2, leading to a marked decrease in cell viability. No human neurological trials specific to M. haplocalyx were identified in the literature.
5.6 Antimicrobial Effects
Evidence level: In vitro only.
Pharmacological studies of M. haplocalyx (M. canadensis) revealed various biological activities, such as antimicrobial, anti-inflammatory, antioxidant, antitumor, gastrointestinal protective, and hepatoprotective activities. The antimicrobial activity has been attributed primarily to the essential oil, particularly its monoterpene components including menthol and menthone, demonstrated in in vitro susceptibility assays.
5.7 Gastrointestinal Effects and Gut Microbiota
Evidence level: Preclinical (animal and in vitro fermentation models); no standalone human trials for M. haplocalyx identified.
In one study, M. haplocalyx extract, utilized as a key component in a feed additive, demonstrated positive regulatory effects on the gut microbiota of fattening sheep. Disruptions in the balance of the intestinal ecosystem can lead to immune system dysregulation. The extract notably increased the relative abundance of beneficial bacteria such as Paraprevotella and Alloprevotella, while reducing the abundance of potentially harmful bacteria like Blautia. These results further corroborate the role of M. haplocalyx extract in regulating gut microbial balance and promoting the growth of beneficial bacteria.
On the polysaccharide side, recent research has highlighted the beneficial effects of the polysaccharide PMHP-3, derived from M. haplocalyx, on gut health. In an in vitro simulated digestion experiment, PMHP-3 exhibited remarkable stability, with unchanged molecular weight, total sugar content, and uronic acid content throughout the digestion process, indicating its resistance to digestion. Moreover, in an in vitro fermentation model, PMHP-3 at a concentration of 12.5 mg/mL significantly lowered the pH of the fermentation broth, a change that correlated with enhanced gut microbiota diversity.
At a broader genus level, a comprehensive systematic review of 16 clinical trials published in Pharmaceuticals (2025) indicated that Mentha species, especially mint oil, significantly reduced abdominal pain and discomfort in patients with irritable bowel syndrome (IBS), functional dyspepsia, and functional abdominal pain. This review pertained to the Mentha genus broadly, with dominant evidence from peppermint (M. piperita) rather than M. haplocalyx specifically.
5.8 Hepatoprotective Effects
Evidence level: Preclinical animal data; human evidence is not established for M. haplocalyx specifically.
It has been reported that the anti-inflammatory, analgesic, choleretic, hepatoprotective, and anti-early pregnancy effects of Mentha are related to its volatile oil. Although the bioactive lead compounds of M. canadensis have been previously investigated for their broad range of pharmacological effects, the potential of its methanolic leaf extract in mitigating liver toxicity remains relatively unexplored, and a specific study examined possible hepatoprotective benefits of the methanolic leaf extract against paracetamol-induced hepatic injury in Swiss albino mice.
Studies in recent years have suggested that volatile constituents of Menthae Haplocalycis Herba can lead to a series of toxic effects, such as liver injury and other toxic symptoms. It is well known that Menthae Haplocalycis Herba is clinically used as a decoction, which indicates that non-volatile components should be responsible for its efficacy. Flavonoids, phenolic acids, and some terpenoids from Menthae Haplocalycis Herba show various activities of antiviral, anti-inflammatory, and antioxidation, which are probably closely related to its traditional efficacy.
5.9 Antitumor / Chemopreventive Effects
Evidence level: In vitro only; no clinical evidence.
Modern pharmacological studies have revealed that M. haplocalyx shows various biological activities, such as antiallergenic, antimicrobial, anti-inflammatory, antioxidant, antitumor, antiviral, gastrointestinal protective, hepatoprotective, and chemopreventive activities. The antitumor findings are derived from laboratory experiments, and daucosterol, a natural sterol identified in M. haplocalyx, is notable for its neuroprotective and anti-cancer properties. No clinical trial data support anticancer use.
6. Body Systems and Health Areas Associated with M. haplocalyx
- Respiratory system: As a traditional Chinese medicine, it is clinically used to treat diseases in the nerve center, breath, procreation, and digestive systems. Anti-asthmatic and expectorant effects are documented in animal models and traditional use.
- Digestive system: Spasmolytic and gut microbiota-modulating properties are supported by preclinical evidence. Menthol content possesses antispasmodic properties that help relax gastrointestinal muscles, potentially relieving stomach pain and bloating.
- Nervous system / Neuroprotection: Linarin, a flavonoid glycoside naturally found in M. haplocalyx, has garnered attention for its diverse biological effects, particularly in inhibiting the progression of neurodegenerative diseases.
- Metabolic / Endocrine: Alpha-glucosidase inhibition and polysaccharide-driven hypoglycemic effects have been documented in vitro, relevant to blood-glucose management.
- Immune and inflammatory systems: Both in vitro and in vivo studies have demonstrated diverse health benefits, such as neuroprotective, anti-asthmatic, anti-inflammatory, gut health improvement, hypoglycemic, anti-aging, anti-bacterial, and antioxidant effects.
- Skin and topical applications: Menthol's cooling sensation and antimicrobial properties are applied topically in cosmetics and analgesic products.
- Liver (TCM context): In TCM, M. haplocalyx is believed to support the free flow of Liver Qi — a concept distinct from the anatomical liver in Western medicine but often associated with emotional regulation and energy flow. The herb is frequently included in formulas intended to "soothe the Liver" or treat symptoms attributed to Liver Qi stagnation. However, the traditional use is based on TCM theory rather than biochemical or physiological evidence regarding the liver organ itself.
7. Dosage Forms and Reported Dosages
7.1 Traditional Decoction (Dried Herb)
In TCM practice, the standard dosage is 2.4–6 g, with the herb put into the decoction last. For a simple tea, 3–6 grams of dried Bo He leaves are steeped in hot water for 5–10 minutes. In decoctions, it is often added during the last 5–10 minutes of cooking to preserve its volatile aromatic compounds.
7.2 Essential Oil
The essential oil is obtained by hydrodistillation. The current Ch.P 2020 uses menthol content (no less than 0.20%) as the sole indicator for assessing the quality of M. haplocalyx in pharmaceutical-grade material, though researchers have noted this single-component standard may not fully reflect overall quality.
7.3 Experimental Concentrations Reported in Studies
- Aerial part extracts inhibited alpha-glucosidase with an IC50 of 21.0 μg/mL in vitro.
- The phenolic fraction (MHP) did not exhibit toxic effects on RAW264.7 cells at 0–200 μg/mL, and linarin at 0–20 μM, over 24 hours.
- In an in vitro fermentation model, polysaccharide PMHP-3 at 12.5 mg/mL significantly lowered pH of the fermentation broth, correlating with enhanced gut microbiota diversity.
8. Quality Control and Species Identification Challenges
The abundance of Mentha species has led to frequent misidentification and mixing of plants within the genus. Accurately identifying the species of M. haplocalyx is a pressing issue that requires resolution. Enhancing the clinical efficacy of M. haplocalyx necessitates distinguishing between different species based on plant morphology, component types and concentrations, pharmacological activities, and genetic characteristics.
The current Ch.P 2020 uses menthol content (no less than 0.20%) as the sole indicator for assessing the quality of M. haplocalyx. However, relying on a single component is insufficient to fully reflect the plant's quality and does not align with the holistic principles of TCM.
The chemical composition of Mentha haplocalyx volatile oils from different origins was studied by GC/MS and comprehensive two-dimensional GC/TOFMS. A total of 67 compounds were identified by GC/MS and a total of 1,956 compounds were identified by GC × GC/TOFMS from five Mentha haplocalyx samples of different origins, underscoring the substantial analytical complexity and geographic variability of this material.
9. Safety Considerations and Interactions
9.1 Traditional Contraindications
Within the TCM system, several specific cautions have been consistently recorded. The herb contains a lot of volatile oil and is not suitable for long decoction. People who are allergic to Bo He should not take it. Patients with deficiency-cold in the spleen and stomach should not take it. Patients with hyperhidrosis should not take it.
9.2 Reproductive Toxicity (Volatile Oil)
The anti-early pregnancy effects of Mentha are related to its volatile oil. The volatile oil can induce vaginal bleeding, embryo peeling, embryo atrophy, and degeneration in pregnant mice. It has anti-fertility effects. These findings, derived from animal studies, indicate caution is warranted regarding use of concentrated volatile oil fractions in pregnancy.
9.3 Volatile Oil and Liver Injury Signals
Studies in recent years have suggested that volatile constituents of Menthae Haplocalycis Herba can lead to a series of toxic effects, such as liver injury and other toxic symptoms. A published case-report review in the context of TCM hepatotoxicity literature noted that two men from Hong Kong with chronic HBV infection took the TCM Bo He (Mentha haplocalyx) in herbal mixtures that contained 11 other ingredients, complicating causal attribution. In one single Japanese woman, liver injury was reported following the use of Kamishoyosan, a traditional Japanese herbal drug (Kampo medicine), which is a herbal mixture containing several components including Mentha haplocalyx, again as part of a multi-herb preparation. In both situations, the contribution of M. haplocalyx specifically versus other formula components was uncertain.
9.4 Penetration Enhancement and Drug Interactions
There is evidence that menthol can enhance penetration of other agents. Formulators have been cautioned that this enhanced penetration can affect the use of other ingredients whose safety assessment was based on their lack of absorption. Studies have found that menthol crystal can promote the penetration of rhynchophylline, and menthol can promote the penetration of metronidazole, suggesting that co-administration with topically or mucosally applied drugs could alter their pharmacokinetics.
9.5 Cytotoxicity Assessment
The toxicity of drugs can have an influence on the proliferation and function of cells. When evaluated in a cell cytotoxicity assay (MTT), MHP and linarin did not exhibit toxic effects on RAW264.7 cells at 0–200 μg/mL and 0–20 μM, respectively, at the concentrations tested in vitro. This does not represent an assessment of systemic or chronic toxicity in humans.
9.6 Gaps in Safety Data
Integrating phytochemicals into liver toxicity treatment, whether through herbal formulations, dietary supplements, or plant-derived therapies, could provide a safer and more holistic therapeutic alternative. However, further rigorous preclinical and clinical research is essential to establish efficacy, safety, and optimal dosing before widespread clinical implementation. Comprehensive human safety trials for M. haplocalyx as an isolated ingredient have not been published in the indexed literature reviewed.
10. Applications Beyond Medicine
The leaves of M. haplocalyx are also used in teas, beverages, jellies, syrups, candies, and other products. These chemical constituents contribute to M. haplocalyx's extensive medicinal properties and nutritional value, making it widely applicable in daily life. In the cosmetics industry, the essential oil and its purified menthol fraction are used for their cooling properties and fragrance. Plant essential oils are increasingly used as food preservatives due to their antibacterial and antioxidant activities.
11. Summary of Evidence Strength
Both in vitro and in vivo studies have demonstrated diverse health benefits, such as neuroprotective, anti-asthmatic, anti-inflammatory, gut health improvement, hypoglycemic, anti-aging, anti-bacterial, and antioxidant effects, for M. haplocalyx. However, the totality of evidence must be characterized accurately. The pharmacological literature on M. haplocalyx is predominantly preclinical — dominated by cell-culture and animal-model experiments. Rigorous human randomized controlled trials specifically involving M. haplocalyx as an isolated ingredient were not identified in the indexed literature at the time of this review. Human clinical evidence at the genus level (chiefly for M. piperita in IBS and functional GI conditions) is more established, but direct extrapolation to M. haplocalyx requires caution.
Despite significant progress in M. haplocalyx research, several issues remain unresolved. The abundance of Mentha species has led to frequent misidentification and mixing of plants within the genus. Accurately identifying the species of M. haplocalyx is a pressing issue that requires resolution.
References
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