Educational information, not medical advice — ask your doctor or midwife.
Ubos is a name used in parts of Latin America for Spondias mombin, a tall tropical tree. Its fruit is a small yellow plum, better known as hog plum, jobo or taperebá. The fruit is eaten fresh and turned into juice, frozen pulp and ice cream.
In folk medicine the leaves and bark matter more than the fruit. Healers brewed them into teas and washes. They also crushed fresh leaves onto wounds and sores.
Here is the short verdict. The fruit is an ordinary food and a useful source of vitamin C.
The healing claims for the leaf and bark rest on lab and animal work. Good human trials are almost absent. Long traditional use is not proof that a remedy works, and it is not proof that it is safe.
No one has shown in people how ubos leaf or bark works. What follows comes from lab dishes and animal tests.
The leaves are rich in tannins. In test tubes, tannins bind proteins and can tighten raw tissue. That may be behind the old use of leaf washes on wounds.
In laboratory tests, leaf extracts slow the growth of some bacteria and fungi. Whether that happens on human skin is not established.
In mice and rats, leaf extracts have lowered blood sugar and eased pain and seizures. Animal results often fail to repeat in people.
Animal work also points to effects on the womb. Extracts made the uterus contract. That is the main safety worry on this page.
The fruit is a different matter. It carries vitamin C, and vitamin C prevents and treats scurvy. That part is settled science.
Most people meet ubos as food. Fresh fruit, frozen pulp, juice, jam and ice cream are sold across Brazil and the Caribbean.
Traditional preparations use other parts of the tree. Common ones are leaf tea, bark decoction and leaf washes for the skin. Fresh crushed leaves were also laid on wounds as a poultice.
Capsules and tinctures of leaf extract turn up online. They are not standardised. You cannot tell their strength from the label.
Spondias mombin has been used across tropical America and the Caribbean for centuries. Indigenous and rural healers treated the tree as both food and medicine.
Recorded folk uses included leaf tea for diarrhoea and fever. Bark decoctions were used as mouth rinses for sore gums and throats.
Women's medicine was a common theme. Leaf preparations were given during childbirth and after it.
That same practice is the reason this page warns so hard about pregnancy. The tree later spread to West Africa, where similar uses took root.
Short answer: Avoid: traditionally used to stimulate the womb.
Educational information, not medical advice — ask your doctor or midwife.
Stop using ubos and call a doctor if you get a rash, swollen lips or face, or trouble breathing. These can be signs of allergy.
Get urgent care if you are pregnant and have taken a leaf or bark preparation. Cramping, bleeding or fluid loss needs same-day attention.
See a doctor instead of treating at home if diarrhoea lasts more than two days, if there is blood in it, or if a child or an older adult is affected.
Also see a doctor if a wound turns hot, swollen or leaks pus. Do the same for a fever above 39 C or one that lasts more than three days.
In Brazil, Colombia, Peru and much of the Caribbean the fruit is an ordinary food sold in markets. Leaf and bark products are sold as supplements in some countries, not as approved medicines. No regulator, including the US FDA and the European Medicines Agency, has approved ubos 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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