Educational information, not medical advice — ask your doctor or midwife.
Alfavaca, also called albahaca de clavo or clove basil, is a leafy kitchen herb used as a home tea. Its botanical name is Ocimum gratissimum. It is a close relative of sweet basil, with a strong clove-like smell.
The plant grows across Latin America, the Caribbean, West Africa and South Asia. In Latin American homes the leaves were brewed for coughs, colds, fevers and upset stomachs. The same leaves season soups, beans and fish.
Here is the honest evidence verdict. Human studies are few, small and mostly about mouth care. Long traditional use is not proof that a plant works, and it is not proof that it is safe.
The leaf, used in food amounts, is generally well tolerated. The essential oil is a different product. It is very concentrated, rich in eugenol, and it carries real risks that the leaf tea does not.
No one has shown in people how alfavaca works, because the human studies needed have not been done.
Most of what is known comes from the laboratory. In test tubes, the oil slows the growth of several bacteria and fungi, including some mouth and gut bugs. Whether that happens inside a living body is not established.
The herb also contains eugenol, the same compound that gives cloves their smell. In cell and animal studies, eugenol appears to dull pain signals and calm inflammation. In animals it has also relaxed smooth muscle, the muscle in the gut and airways.
That last finding is the usual explanation offered for the traditional use in coughs and cramps. It remains an explanation, not a proven effect.
Animal work has also reported lower blood sugar and lower blood pressure after extracts were given. These were rodent studies, often at high doses. They do not show that a cup of tea does the same thing in a person.
One practical point matters more than the mechanism. The oil content of this plant varies a lot by region and growing conditions.
Some plants are mostly eugenol, others mostly thymol or cineole. So two batches of the same herb can act quite differently.
You will most often meet alfavaca as fresh or dried leaves.
Common forms include:
- fresh leaves used as a cooking herb - dried leaf for tea (infusion) - the steam-distilled essential oil, sold for scent and diluted skin use - mouthwashes and toothpastes that list the oil as an ingredient - tinctures (alcohol extracts), less common - capsules of dried leaf powder, uncommon outside specialist shops
The essential oil is not a strong tea. It is many times more concentrated. It is meant for external or flavouring use only, and is sold as such.
Alfavaca has a long and well-recorded place in Latin American home medicine. Healers and families brewed the leaves for coughs, colds and fevers. It was also given for stomach cramps, gas and diarrhoea.
The plant is thought to have reached the Americas from Africa, where it is also an old household remedy. In parts of Brazil and the Caribbean it was used in steam inhalations and in baths. Crushed leaves were rubbed on skin to keep insects away.
It also had a ritual and household role, grown near doorways and used in cleansing baths. Writers on folk practice in Mexico, Puerto Rico and Brazil all describe it.
This page describes those past uses. It does not recommend that you copy them.
Stop and see a doctor if a rash, swelling or breathing trouble starts after use. These can signal an allergic reaction.
Get urgent care if anyone swallows the essential oil. Warning signs include vomiting, belly pain, drowsiness, confusion or yellow skin or eyes. A child who swallows a clove-type oil needs emergency care straight away.
Also see a doctor if a fever lasts more than three days, if diarrhoea lasts more than two days, or if a cough drags on past three weeks.
In the United States the leaf is an ordinary food herb, and eugenol is an approved flavouring. In the UK and the EU it is sold as a food or food supplement. No medicines regulator has approved it to treat any condition.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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