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A Little Bit About Peppermint

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Botanical Name: Mentha x piperita.


All true mints belong to the genus Mentha. Peppermint is a hybrid plant, a cross between watermint (Mentha aquatica) and spearmint (Mentha spicata). 

Common Names: Peppermint, mint, menthol

Habitat: Peppermint is found growing wild in the moist soils of the warmer parts of Europe, Asia, and America. It was cultivated in Europe but also in America, where it has become a vital crop over the last one hundred years. Peppermint is a perennial shrub which grows best in very moist soils with high water-holding capacity. While the plant has proved invaluable in medicine, for both topical and oral uses, it is also used widely in the perfume, soap and of course the food industries, becoming the most commercially important of the Mentha species. It has a fresh odor and a persistent cooling taste. Annually in the United States, over 1,000,000lb of peppermint oil is produced.

Plant Description: The peppermint plant grows to about 2-3 feet in height. It produces very small purple or white flowers that bloom from July through August. The leaves are dark green and fragrant.

Plant Parts Used: The leaves are harvested when the plant is in bloom and the leaves are at their most flavoursome. The oil is used for pharmaceutical preparations, as well as a flavor for gum and candy, etc… The stems and leaves can be used for tea. Although there are hundreds of kinds of mint, Peppermint is the one most often used medicinally. Menthol is found in Peppermint and Japanese mint, and is distilled from the oil.

Constituents volatile oil (mainly menthol [35-55%] and menthone [10-40%]), flavonoids (luteolin and menthoside), phenolic acids, triterpenes, tannins, tocopherols, choline, azulines, carotenes

Actions: Antibacterial, antiviral, antifungal, antiparasitic, antispasmodic, antinausea, antiseptic, analgesic, carminative, digestive tonic, increases sweating while cooling internally, relieves muscle spasms, relaxes peripheral blood vessels, stimulates bile secretion, topical anesthetic (but can also be an irritant)

Taste: Pungent, Slightly Sweet

Energy: Cooling

Works Well With: Liquorice & Ginger for Digestive Disorders

Organs & Systems Affected: Head, Heart, Lungs, Stomach, Intestines, Liver, Uterus, Nerves


Peppermint as a tea has become very popular and it is thought to have a number of health benefits for variety of ailments such as biliary disorders, dyspepsia, enteritis, flatulence, gastritis, intestinal colic, and spasms of the bile duct, gallbladder and gastrointestinal (GI) tract. When the steam from the tea is inhaled it can ease sinus congestion and the inflammation of the mucous membrane in the nose and throat. In Germany, peppermint leaf tea has been licensed for use during indigestion or dyspepsia. The oil has been used as an herbal pain relief and is a common ingredient in products aimed at athletes to soothe sore muscles. Peppermint oil, as an external treatment, has been approved for myalgia, muscle pain, and neuralgia and nerve pain.The essential oil of peppermint has been used as a topical application to repel insects. In India, researchers at the Malaria Research Centre in Delhi have found that the oil repels adult mosquitoes and can kill the larvae. This, in turn, can have positive effects on diseases such as Dengue Fever and Malaria. The camphor or menthol, derived from the peppermint oil is used as an antiseptic when treating colds, as a topical counter-irritant. It has been shown, that peppermint oil can reduce the muscle spasms in the upper and lower gastrointestinal tract of patients undergoing endoscopies, barium enemas, and colonoscopies and also that peppermint oil in capsule form can relax the muscle in the stomach and small intestine, which would ease cramping. It has been approved for internal use by the German Commission E, to effectively treat the gastrointestinal tract, gall bladder, and bile ducts. It is also approved for irritable colon and as a remedy for irritable bowel syndrome, where it has been shown to provide mild relief for the symptoms of flatulence, abdominal pain and distension. A number of studies have investigated the antioxidant effect of Mentha piperita. For example, an aqueous solution of previously frozen, yet fresh leaves were found to have the highest level of oxygen radical absorbance capacity, among a group of other popular medicinal herbs. It was also found to have a higher free radical scavenging capacity than other species in the genus Mentha and off all tea infusions, it was the peppermint tea that was found to have the greatest antioxidant capacities. It has been noted that peppermint may have cancer-fighting and anti-tumour abilities. It was shown to significantly suppress the effect of okadaic acid which promotes tumour formation. A high dose of menthol derived from the herb reduces the activity of cytosolic arylamine N- acetyltransferase (NAT) activity in the human liver tumor cell, however, this effect lessens with dose, and at very low doses can promote NAT relative to other substances. Studies have shown that the flavonoid glycoside, luteolin-7-O-rutinoside, obtained from Mentha piperita has a significant effect on the inhibition of histamine release. Menthol was also found to suppress the production of inflammatory mediating compounds. It has therefore been suggested that peppermint can play a role as an anti-allergenic. It has been noted that peppermint has anti-viral properties and aqueous extracts from the plant have significant effects on influenza viruses. The herb has been shown to inhibit influenza virus reproduction, reducing the infectiousness. In 1998, a study demonstrated that Mentha piperita was highly potent against the human immunodeficiency virus-1 (HIV-1) at a dose of 16µg/mL. Peppermint oil has been extensively researched concerning its antibacterial abilities. Its components menthol and menthene have shown a moderate inhibitory effect against human pathogens, such as Staphylococcus aureus, Listeria, Staphylococcus epidermis. One study found peppermint oil to be effective against 22 independent bacterial strains. Menthol is the most effective of the peppermint components, shown to be quite effective for gastrointestinal bacteria.

Science on Peppermint

~ The external application of Peppermint oil (10% mixed with ethanol) reduced headache sensitivity and intensity comparable with the drug acetaminophen (equivalent to 1 gram or two capsules of Paracetamol) in a randomised, double-blind, placebo-controlled crossover trial (Gobel H, Fresenius J, Heinze A et al. Nervenarzt 1996;67(8):672-681)

~ In a randomised, double-blind, multicenter, plabebo-controlled trial 75% of children with irritable bowel syndrome who received enteric-coated peppermint oil experienced reduced severity of pain after two weeks of treatment (Kline RM et al.J Pediatr 138(1):125-128, 2001)

~ A 4 week study done with patients with asthma showed that daily inhalation of menthol (from Peppermint) significantly decreased airway hypersensitivity (Tamaoki J, Chiyotani A, Sakai A et al. Respir Med 1995;89(7):503-504)

~ Peppermint was tested in a large double-blind, placebo-controlled study with people suffering from severe indigestion where it was compared with a motility drug called cisapride. Significant pain relief was achieved with both the drug and the Peppermint over the 4 weeks of the trial (Madisch A et al. Arzneim Forsch 49(11):925-932,1999)

~ A liquid herbal formula containing Peppermint, Fennel, Caraway and Wormwood was significantly superior to the drug metoclopramide (a drug used to reduce spasm) in terms of relieving symptoms in a randomised, double-blind, controlled study in patients with dyspepsia i.e. painful indigestion (Westphal J, Horning M, Leonhardt K. Phytomed 1996; 2(4):285-291)

~ A similar study that used a tablet form of the above herbs (with Gentian instead of Wormwood) also had excellent results in patients with chronic digestive problems such as flatulence or bloating (Silberhorn H, Landgrebe N, Wohling D et al. 6th Phytotherapy Conference, Berlin, Oct 5-7, 1995)


Individuals with achlorhydria, biliary or gall bladder obstruction, or gallstones, acid reflux or issues of the esophagus should not use peppermint. Highly concentrated peppermint oil should not be rubbed on or inhaled profusely as it can cause dermatitis, flushing or headaches. Over consumption of peppermint can also cause peristaltic actions of the colon to relax, slowing the movement of food in the alimentary tract, and thus is not recommended after dinner, or for people with a hiatal hernia. The leaf contains tannins which if overly consumed can cause liver damage. Menthol products should not be given to young children because nasal preparations could cause gagging, or spasms of the glottis (the opening between the vocal cords in the throat), resulting in airway obstructions.


Bartrams Encyclopedia Herbal Medicine

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