What is Bush mint (bush tea bush)?

Bush mint is a strong-smelling weedy herb of the mint family. Its botanical name is Hyptis suaveolens. In West Africa the leaves are brewed as a tea and burned to keep mosquitoes away.

It is called daddoya ta daji in Hausa and efinrin aja in Yoruba. The plant grows across the tropics and is often treated as a weed. Leaves, stems, seeds and the pressed oil have all been used.

Here is the honest verdict. Almost all the research sits in test tubes and animals. Long use in tradition is not proof that it works, and it is not proof that it is safe.

How does Bush mint (bush tea bush) work?

No one has shown in people how bush mint works, or that it works at all.

The smell comes from an essential oil full of terpenes, the scent chemicals found in many herbs. In laboratory tests, this oil slows the growth of some bacteria and fungi. Whether that happens inside your body is not known.

In small field studies in Africa, smoke from burning the leaves cut the number of mosquitoes landing on people indoors. That is an effect on insects in a room, not a medicine effect in you.

In animal studies, leaf extracts have eased fever, pain signals and blood sugar. Animal results often fail to repeat in people. Treat them as a reason to study the plant, not as a result you can count on.

What forms does Bush mint (bush tea bush) come in?

Bush mint turns up in a few plain forms.

- dried leaf, loose or in tea bags - fresh leaf, brewed at home or crushed onto skin - bundles of dried stems burned as a smoke or smudge - essential oil, sold for scent and skin use - seeds, soaked in water and eaten like chia in some regions - creams, soaps and insect sprays that list the oil

Strength is not controlled in any of these. A tea and an oil are very different things, and the oil is far more concentrated.

Where it comes from:

Bush mint has a long record in West African home medicine. Healers in Nigeria, Ghana and Benin used leaf teas for fever, colds, coughs and stomach upset. Crushed leaves were laid on cuts, boils and insect bites.

Burning the dried plant indoors at dusk was a common way to drive off mosquitoes and flies. The same use is recorded in India and parts of Latin America, where the plant also spread.

The plant came from tropical America and travelled with trade. It settled into local practice so well that many people take it for a native African herb. These records describe what people did; they are not a sign that self-treatment is wise today.

What does Bush mint (bush tea bush) help with?

• Keeping mosquitoes away (burned leaves or oil): This is the use with the most human data behind it, and it is still thin. Small field studies counted fewer mosquitoes landing on people in rooms where the leaves were burned. That is not the same as preventing malaria. No trial has shown fewer infections. Smoke also irritates the lungs, so it is a poor choice for anyone with asthma.
• Fever and colds: Tradition used hot leaf tea and steam for fever, chills and blocked noses. In animal studies, extracts lowered raised body temperature. There are no human trials for this use. A hot drink and steam may feel soothing on their own. A high fever still needs proper assessment.
• Stomach upset and gas: Bitter mint-family teas were widely used after heavy meals and for cramping. In animals, extracts relaxed gut muscle in some tests. No human study has tested bush mint for indigestion. If stomach pain is new, severe or lasting, it needs a doctor rather than a herb.
• Minor cuts, boils and skin complaints: Crushed leaves were pressed onto wounds, sores and bites across West Africa. In laboratory tests the oil slows several bacteria and fungi. That has not been shown to help a wound heal on a person. Raw leaf on broken skin can also bring in dirt and germs. Deep, dirty or spreading wounds need medical care.
• Aches and pains: Leaf tea and warm poultices were used for headache, joint pain and sore muscles. Animal studies suggest extracts dull pain responses and calm swelling. No human trial supports this. Any relief you feel may come from the warmth and rest as much as the plant.
• Food use (seeds and leaf as flavouring): The seeds swell in water into a jelly and are eaten in drinks in some regions. The leaf is used sparingly as a pungent flavouring. Food amounts are small and are not a treatment. Eating the plant as food says nothing about the safety of strong teas or the oil.

Which foods are rich in Bush mint (bush tea bush)?

Bush mint is not a nutrient, so no food is rich in it. The seeds are soaked and eaten in some regions, much like chia. The leaf is used now and then as a pungent flavouring.

What are the side effects of Bush mint (bush tea bush)?

• Skin rash or itching where leaves or oil touch the skin
• Burning in the mouth or throat from strong tea
• Nausea, stomach pain or loose stools
• Feeling sleepy or slowed down
• Coughing, wheezing or sore eyes from the smoke
• Headache from the strong smell
• Low blood sugar signs, such as shakiness and sweating
• Allergic reaction, with swelling, hives or trouble breathing

Good to know:

Most reported problems are mild. They come from everyday use and case reports, not from trials.

Skin rash and stomach upset are the usual complaints. Smoke and undiluted oil carry the clearest risk of harm.

The bigger issue is what nobody has measured. No study has followed people taking bush mint for weeks. Absence of reports is not the same as proof of safety.

How much Bush mint (bush tea bush) should you take?

• Recommended daily: There is no agreed dose for bush mint, and no human trial has set one. Where dried leaf is sold as tea, labels usually suggest about 1 to 2 grams per cup, once or twice a day. That is a label figure, not advice for you. The essential oil is a concentrated product. It is used for scent, or diluted on skin, and is never swallowed. Strength varies widely between batches and sellers.
• Best time of day: Time of day has not been studied and probably matters little. Some people find the smell strong and keep it for the evening. Smoke from burning leaves is traditionally lit at dusk, when mosquitoes bite most.
• With or without food: Tea is usually drunk after food. Taking it with food may cut the chance of stomach upset or nausea. Food does not change whether the herb works.
• Time to effect: If a tea eases comfort at all, people tend to notice within an hour. Skin and repellent uses act only while the oil or smoke is there. It may also do nothing. With evidence this thin, that is a real and likely outcome.
• How long to take it: Tradition used it in short bursts, over a few days during a fever or stomach upset. No study has tracked people taking it for weeks or months. So a safe long-term span cannot be given. Daily use that runs on and on is not supported by anything we have.