Educational information, not medical advice — ask your doctor or midwife.
Juanilama is a bushy, lemon-scented shrub from Latin America. Its botanical name is Lippia alba. English sources also call it bushy matgrass.
The leaves are brewed as a hot tea. Home use has long centred on nerves, poor sleep, stomach cramps and colds.
Here is the honest verdict on the evidence. Almost all of the research is in test tubes and rodents. Long traditional use is not proof that a remedy works, and it is not proof that it is safe.
No one has shown how Juanilama works in the human body.
The scent comes from a volatile oil in the leaf. In rodent studies, oils rich in citral have calmed movement and helped animals sleep longer.
In test tubes, leaf extracts relax the smooth muscle of the gut and airway. That is the usual reason given for the folk use in cramps. Whether a cup of tea does the same in you is unproven.
Lab tests also show that the oil slows some bacteria and fungi. That happens in a dish, not on skin or inside a person.
Animal work has shown a drop in blood pressure and a slower heart rate with the oil. This matters more as a safety signal than as a benefit.
Most people use the leaf as a simple hot tea.
Forms you may meet:
- Dried loose leaf for an infusion
- Fresh leaf picked from a garden
- Tinctures, which are alcohol extracts in dropper bottles
- Essential oil, sold for scent and not for swallowing
- Capsules, which are uncommon
Tea is the traditional form across Latin America. Products are not made to one agreed standard, so strength varies.
The essential oil is a very strong product. It is not a food and is not the same thing as the tea.
Juanilama has a long, well-recorded place in Latin American home medicine. Healers in Brazil, Colombia, Costa Rica, Cuba, Mexico and Venezuela used the leaf tea.
It was given for nerves, restless sleep, stomach cramps, period pain, colds and fever. The crushed leaf was also used in washes and baths.
Local names include erva-cidreira and falsa-melissa in Brazil, pronto alivio in Colombia, and mastranto in Venezuela. Writers often mixed it up with lemon balm because of the smell.
Some health ministries have listed the plant among herbs widely used by the public. Such a listing records habit and interest, not proof of benefit.
Stop Juanilama and get urgent care if you faint, your heart feels very slow or odd, or your lips, tongue or throat swell. Trouble breathing after any dose is an emergency.
See a doctor soon if a rash spreads, if you vomit, or if you feel drowsy for hours after a cup.
Book a normal appointment if sleep problems, anxiety, belly pain or a cough last more than two weeks. A fever above 39C, or any fever lasting more than three days, needs a doctor rather than tea.
In the United States, Juanilama is sold as a herbal tea or supplement. It is not approved to treat any disease. In Brazil it appears on official lists of plants used in public health care, which records use rather than proven benefit.
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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