What is ubos?

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.

How does ubos work?

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.

What forms does ubos come in?

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.

Where it comes from:

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.

What does ubos help with?

• Wound and skin care (traditional): Healers washed cuts, sores and boils with leaf water. In laboratory tests, leaf extracts slow some bacteria and fungi, and the tannins bind protein. There are no good human trials for wound healing. Clean water, soap and proper dressing remain the proven basics.
• Diarrhoea (traditional): Leaf and bark teas were a common home answer to loose stool. Tannins are astringent, which means they tighten tissue, and that is the usual explanation offered. Human evidence for ubos here is essentially missing. Fluids and salts are what prevent harm from diarrhoea, and they are not optional.
• Sore mouth, gums and throat (traditional): Bark decoction was used as a rinse or gargle for sore gums and mouth ulcers. The tannin content gives a dry, puckering feel that users read as relief. No controlled trial supports this. A sore in the mouth lasting over three weeks should be looked at by a dentist or doctor.
• Fever (traditional): Leaf tea was given for fever in several Latin American and Caribbean folk systems. Animal studies have reported some fever-lowering and pain-easing effects from leaf extracts. This has not been tested properly in people. Fever with a stiff neck, rash or confusion is an emergency, not a tea problem.
• Vitamin C in the diet (from the fruit): The fruit is a real food source of vitamin C and carotenoids. Vitamin C prevents and treats scurvy, and that effect is proven in people. This is a nutrition benefit, not a medicine claim. Eating taperebá will not treat any disease beyond vitamin C shortage.
• Childbirth and after-birth use (traditional, and unsafe to self-manage): Leaf preparations were given by traditional birth attendants to speed labour and help the womb clamp down after birth. Animal studies do show uterine contraction from leaf extracts. A few small hospital studies, mostly from West Africa, have looked at this. They are far too thin to support use. Treat this as a hazard, not a use. Never take ubos leaf or bark to start labour or end a pregnancy.

Which foods are rich in ubos?

1. Fresh hog plum (taperebá, jobo) fruit
2. Frozen taperebá pulp
3. Taperebá juice
4. Taperebá ice cream and sorbet
5. Hog plum jam and jelly

Practical Tips:

As a food the fruit is well liked and safe for most people. It brings vitamin C, carotenoids and fibre. Food amounts of the fruit are not the same as concentrated leaf or bark products.

What are the side effects of ubos?

• Nausea or stomach ache from strong leaf or bark tea
• Constipation from high tannin intake
• Dry, puckering feeling in the mouth
• Poorer iron uptake with regular tannin-rich tea
• Loose stool from eating a lot of unripe fruit
• Tooth and mouth irritation from the acid juice
• Skin rash or itching after contact with leaf or sap
• Allergic reaction, rare but possible, more likely if you react to mango or cashew

Good to know:

Most of what we know comes from eating the fruit, which people tolerate well. Side effects from strong leaf and bark preparations are poorly tracked.

The serious risk is not really a side effect. It is the effect on the womb, which makes these preparations unsafe in pregnancy.

How much ubos should you take?

• Recommended daily: There is no agreed dose for ubos leaf or bark, and this page gives none. The fruit is food, and people eat it as they would any other fruit. Capsule labels for leaf extract often list 300 to 500 mg per serving. That figure rests on no human research and is not advice for you. Home teas and bark decoctions vary wildly in strength. Two cups brewed in two kitchens are not the same drink.
• Best time of day: Time of day does not matter much here, and no study points to a better hour. The fruit and its juice fit any meal.
• With or without food: The fruit is food and needs no rules. Leaf and bark teas are tannin-rich and can sit badly on an empty stomach. Tannins also cut how much iron your body takes from food. Keep such teas well away from iron pills and iron-rich meals.
• Time to effect: Folk use expected a gum rinse or skin wash to ease things within a few days. No trial backs that up. It may also do nothing at all. If a problem is not clearly better in two or three days, stop guessing and get it checked.
• How long to take it: No safe length of use has been set for the leaf or bark. Folk use was short and aimed at a passing problem. Daily tannin-rich tea over weeks or months has not been studied in people. High tannin intake over long periods can block iron and upset the gut.