Spearmint, or Mentha spicata, is a type of mint similar to peppermint.
It’s a perennial plant that hails from Europe and Asia but now commonly grows on five continents around the world. It gets its name from its characteristic spear-shaped leaves.
Spearmint has a pleasantly sweet taste and is frequently used to flavor toothpaste, mouthwash, chewing gum and candy.
One common way to enjoy this herb is brewed into a tea, which can be made from either fresh or dried leaves.
Yet, this mint is not only tasty but may also be good for you.
Here are 11 surprising health benefits of spearmint tea and essential oil.
Spearmint is commonly used to help relieve symptoms of indigestion, nausea, vomiting and gas.
The compound (-)-carvone, which is naturally found in spearmint, has been shown to strongly inhibit muscle contractions in the digestive tract, which may explain how this herb helps relieve digestive upsets (1).
In an eight-week randomized study in 32 people with irritable bowel syndrome (IBS), one group was given a product containing spearmint, lemon balm and coriander along with loperamide for diarrhea or psyllium for constipation (2).
At the end of the study, people who received the spearmint-containing supplement reported less abdominal pain, discomfort and bloating compared to those in the placebo group.
This herb may also relieve nausea and vomiting caused by chemotherapy.
In one study, spearmint essential oil applied to the skin significantly reduced the incidence of nausea and vomiting compared to a placebo (3).
Therefore, while studies on the effects of this type on mint on digestion are limited, some evidence suggests that it may be helpful.
Summary Spearmint has been shown to relieve digestive symptoms, such as nausea, vomiting, abdominal pain and bloating, though more research is needed.
Antioxidants are natural chemical compounds found in plants that help protect against and repair damage caused by free radicals, which are harmful molecules that can lead to oxidative stress.
Spearmint contains a large number of antioxidant compounds, including rosmarinic acid, flavones and flavanones like limonene and menthol (5).
According to researchers, spearmint shows excellent antioxidant activity against free radicals. In one study, extract from this herb prevented fat oxidation in meat and was as effective as the synthetic antioxidant BHT (8).
Summary Spearmint is high in beneficial antioxidant compounds that help protect against and repair damage caused by free radicals.
For women with hormone imbalances, spearmint tea may provide relief.
Studies in women have shown that it can decrease male hormones like testosterone while increasing female hormones necessary for ovulation, such as luteinizing hormone (LH), follicle-stimulating hormone (FSH) and estradiol.
In one five-day study in 21 women with hormone imbalances, two cups of spearmint tea a day decreased testosterone and increased LH, FSH and estradiol levels (9).
Similarly, in a 30-day randomized study, 42 women with polycystic ovary syndrome (PCOS) who drank spearmint tea twice a day had lower testosterone levels and higher LH and FSH levels compared to women who drank a placebo tea (10).
Additionally, in a study in rats, spearmint essential oil was found to decrease testosterone and ovarian cysts and increase the number of viable eggs in the rats’ ovaries (11).
Summary Spearmint tea may have beneficial effects on hormones in women, including decreasing male hormones like testosterone and increasing hormones necessary for ovulation.
Drinking spearmint tea may help reduce hirsutism, or growth of dark, coarse hair on the face, chest and abdomen of women.
In fact, it’s a common herbal remedy for unwanted hair growth in Middle Eastern countries (12).
High levels of male hormones, or androgens, are linked to an overgrowth of facial hair in women (9).
Two studies in women with facial hair have shown that drinking spearmint tea may help.
In one five-day study, 12 women with PCOS and nine women with facial hair due to unknown causes were given two cups of spearmint tea twice a day during the follicular phase of their menstrual cycle (9).
While the study was not long enough to determine whether spearmint affected facial hair, the women’s testosterone levels were reduced.
In a longer, 30-day study in 41 women with PCOS, women who drank two cups a day of spearmint tea reported a reduction in their facial hair (10).
However, 30 days may not be long enough to see a definitive difference.
Summary Two cups of spearmint tea a day may help reduce facial hair growth in women. Studies have shown it may help lower testosterone, which is linked to the growth of facial hair.
There’s some evidence that this herb may help improve memory.
Studies have shown that mice given a spearmint extract experienced improved learning and memory as shown by their performance on a maze test (13).
In a more recent study, older adults with memory impairment who were given daily supplements containing 900 mg of spearmint extract experienced a 15% improvement in working memory (17).
Therefore, the evidence on the benefits of this type of mint for memory is limited but promising — especially for older adults.
Summary Some studies have shown a benefit of spearmint extract on memory in older adults, but more research is needed.
Spearmint is a popular flavoring agent in toothpaste, breath mints and chewing gums.
However, it does more than freshen your breath — it also has antibacterial and antimicrobial properties, which may help kill the bacteria in your mouth that cause bad breath.
Additionally, it has been shown to work against bacteria that cause foodborne illnesses, including E. coli and Listeria (20).
Summary Spearmint has antibacterial activity against several types of harmful bacteria, including bacteria that cause foodborne illnesses, such as E. coli and Listeria.
Spearmint tea may help lower blood sugar in people with diabetes.
While human-based studies on this potential effect are lacking, animal studies have shown promising results.
In one study, rats were given a spearmint extract equivalent to 9 mg per pound (20 mg per kg) of body weight per day. While healthy rats appeared unaffected, rats with diabetes had significantly lower blood sugar (21).
In another 21-day study in rats with diabetes, animals given 136 mg per pound (300 mg per kg) of body weight per day of this type of extract showed a 25% reduction in blood sugar (22).
Summary Though human studies on the effects of spearmint on blood sugar are lacking, animal research has shown that this herb may significantly lower blood sugar in rats with diabetes.
Spearmint tea may help promote relaxation and reduce stress.
In fact, in South American countries, this tea is commonly used to treat stress and insomnia.
In one study in rats, a spearmint extract was found to decrease anxiety and improve sleep (23).
Additionally, the leaves of this plant contain menthol, which has a relaxing, sedative effect on the body.
It’s believed that spearmint promotes relaxation and alleviates stress by interacting with GABA receptors in your brain. GABA is a neurotransmitter involved in reducing nerve activity (24).
Summary Spearmint tea is commonly used to relieve stress. While studies are limited, this mint contains compounds that have been shown to promote relaxation and reduce stress.
Spearmint may help relieve joint pain caused by arthritis.
A large review study of both animal and human studies concluded that essential oils made from this mint had pain-relieving effects (25).
Similarly, in one 16-week study in 62 people with arthritis of the knee, regular spearmint tea consumed twice daily reduced stiffness and physical disability, while a spearmint tea high in rosmarinic acid relieved the same symptoms and reduced pain (26).
Summary Spearmint has shown beneficial effects on arthritis pain in both human and animal studies. Additionally, tea made from this herb may help reduce stiffness and disability caused by arthritis.
Spearmint may help lower high blood pressure.
Though human studies on this potential property are unavailable, some scientific evidence suggests that this herb may have beneficial effects in this regard.
A compound in spearmint called (-)-carvone has been shown to act similarly to calcium-channel blockers, medications used to treat high blood pressure (1).
In fact, in one animal study, (-)-carvone was shown to be 100 times more potent at reducing blood vessel contractions than verapamil, a commonly used blood pressure medication (1).
Summary While evidence on the effects of spearmint on blood pressure is limited, studies have shown that it works similarly to common blood pressure medications.
Spearmint is easy to add to your diet.
You can purchase spearmint in tea bags or as loose-leaf tea, or grow your own for brewing.
To make the tea at home:
- Boil two cups (473 ml) of water.
- Remove from heat and add a handful of torn spearmint leaves to the water.
- Cover and steep for five minutes.
- Strain and drink.
This herbal tea is delicious hot or cold. It’s also caffeine- and calorie-free, making it a naturally sweet treat you can enjoy at any time of the day.
While spearmint and its oil are likely safe to ingest in the amounts commonly found in food or tea, it’s unknown whether pure spearmint oil taken by mouth is safe (27).
Undiluted use of spearmint oil may be irritating to the skin and mucous membranes.
Summary Spearmint tea can be enjoyed hot or iced at any time of the day. It’s unclear whether pure spearmint oil can safely be ingested, so you should not take it by mouth.
Spearmint is a delicious, minty herb that may have beneficial effects on your health.
It’s high in antioxidants and other beneficial plant compounds that may help balance hormones, lower blood sugar and improve digestion. It may even reduce stress and improve memory.
Overall, spearmint makes a great addition to any diet — particularly in the form of spearmint tea, which can be enjoyed hot or cold.