What is rose apple?

Rose apple is the fruit of Syzygium jambos, a small tree in the myrtle family. The fruit is pale yellow or pink, crisp, and hollow inside. It smells strongly of roses, which is how it got its name.

In the Caribbean it is called pomme-rose in Haiti and Martinique. In Cuba and the Dominican Republic it is called pomarrosa. The tree came from Southeast Asia and now grows wild across the islands.

Most people meet it as a food. The ripe fruit is eaten fresh or made into jam, stewed fruit, syrup and cold drinks. That use is ordinary and well established.

Folk medicine also used other parts of the tree: the leaves, bark, roots and seeds. These are not food. Reports describe cyanide-forming compounds in the seeds and leaves, so those parts carry a real hazard.

Here is the honest verdict. Good human studies on rose apple as a medicine are almost absent. Long traditional use is not proof that a remedy works, and it is not proof that it is safe.

How does rose apple work?

No mechanism for rose apple as a medicine has been shown to work in people. What follows is laboratory and animal work only.

Leaf and bark extracts are rich in tannins. Tannins are plant compounds that bind protein and taste drying in the mouth. This is the likely reason old remedies used bark washes on sores and loose bowels.

In test tubes, leaf extracts slow the growth of some bacteria and fungi. Whether this does anything on skin or inside the body is not established.

In cell studies, extracts of the leaf mop up free radicals, which are unstable molecules linked to cell damage. Antioxidant activity in a dish often fails to show up as a health effect in people.

In rats fed leaf extracts, blood sugar has fallen in some experiments. These were animal studies with small numbers. No trial has shown the same thing in humans, so this must not be treated as a treatment for diabetes.

The fruit itself works the way any juicy fruit works. It gives water, a little fibre, and small amounts of vitamin C. There is no special action beyond that.

What forms does rose apple come in?

The fruit is the only form most people should consider.

Fresh fruit is sold in Caribbean markets in season. It is eaten raw, out of hand.

Cooked forms are common at home. These include jam, jelly, stewed fruit, syrup and sweet preserves.

Drinks are also made from the pulp. Juice, punch and home-made liqueurs all appear in island cooking.

Folk preparations used other parts of the tree. Leaf teas, bark decoctions, root preparations and powdered seeds all show up in older accounts.

This page gives no method for making any of those. The leaf, bark, root and seed preparations are not food, and their safety has not been tested.

A few herbal suppliers sell dried Syzygium jambos leaf or extract capsules online. These products are not standardised. There is no agreed strength, and no trial supports their use.

Where it comes from:

Rose apple reached the Caribbean through colonial plant trade from Asia and the Pacific. It spread fast and became a familiar yard and roadside tree.

In Haitian and Martinican practice the tree was known as pomme-rose. In Cuba and the Dominican Republic it was pomarrosa. The fruit was mainly a food and a flavouring.

Healers also used the tree's other parts. Bark and leaf decoctions were used as washes for sores and sore eyes. Seed and bark preparations were given for diarrhoea and dysentery.

Some Caribbean and Latin American records list leaf tea for fever, and root preparations as a diuretic, meaning something that makes you pass more urine. Elsewhere, in Brazil and India, leaf preparations were used for high blood sugar.

These uses were recorded by folklorists and botanists, not tested in trials. They tell you what people did. They do not tell you whether it helped.

What does rose apple help with?

• eaten as an ordinary fruit: This is the one use that stands up. The ripe fruit is a safe food for most people. It gives water, a little fibre and some vitamin C. Expect nothing more than that.
• diarrhoea (traditional use only): Caribbean healers used bark and seed preparations for loose bowels and dysentery. Tannins are astringent in the laboratory, which may be where the idea came from. No human trial has tested this. The seeds in particular carry a cyanide risk, so this page gives no preparation method.
• sore throat and mouth sores (traditional use only): Bark and leaf washes were used as gargles in older practice. The drying feel of tannins can seem soothing. There is no trial evidence in people. Plain salt water is a better studied option for a sore mouth.
• skin sores and minor wounds (traditional use only): Leaf and bark washes were applied to sores. In test tubes, leaf extracts slow some bacteria and fungi. Whether this helps a real wound heal is unknown. An infected wound needs proper care, not a plant wash.
• fever (traditional use only): Leaf tea for fever appears in several island records. No study has measured whether it lowers body temperature in people. A fever that is high or lasting needs a doctor, not a home tea.
• high blood sugar (traditional claim, not supported in people): Leaf extracts lowered blood sugar in some rat studies. That result has never been repeated in a human trial. Do not use rose apple in place of diabetes medicine. Stopping your prescribed treatment can be dangerous.

Which foods are rich in rose apple?

Rose apple is itself a food. The ripe fruit is eaten fresh or cooked into jam, syrup and drinks across the Caribbean. It is a pleasant fruit with modest nutrition, not a health food.

What are the side effects of rose apple?

• stomach upset or cramps from unripe fruit
• constipation from tannin-rich leaf or bark teas
• nausea and vomiting
• mouth itching or rash in people allergic to the fruit
• headache, dizziness, confusion or fast breathing after swallowing seeds or leaf preparations
• reduced absorption of iron from meals, if strong tannin teas are drunk often

Good to know:

The ripe fruit is a common food and rarely causes trouble. Mild stomach upset is the usual complaint, and it passes.

The risk sits with the non-food parts. Seeds, leaves and roots have been reported to hold cyanide-forming compounds. Signs of cyanide poisoning are a medical emergency, not a side effect to wait out.

Allergy to the fruit is possible but uncommon. Stop eating it if your mouth itches or you come out in a rash.

How much rose apple should you take?

• Recommended daily: For the fresh fruit, treat it as any other fruit. A normal serving is one or two fruits, the way you would eat a plum. There is no reason to eat more for health. For leaf, bark, root or seed preparations, this page gives no amount. No safe dose has been set in people. Those parts have been reported to contain cyanide-forming compounds, and the risk is not worth guessing at. Commercial leaf capsules carry label amounts that vary widely between brands. Those numbers come from the seller, not from trials. They should not be read as proof of a safe dose.
• Best time of day: Timing does not matter for the fruit. Eat it whenever you like a piece of fruit. No time of day has been shown to change any effect.
• With or without food: The fruit can be eaten alone or with a meal. Very unripe fruit is more likely to upset the stomach, especially on an empty one. Choose fruit that is ripe and fragrant.
• Time to effect: As a food, it tastes good right away and does nothing beyond that. As a medicine, no time to effect can be given. No human trial has measured one. It is entirely possible that it does nothing at all for the conditions tradition claimed.
• How long to take it: The fruit can be eaten in season like any other fruit, with no time limit. For medicinal preparations, no safe length of use can be given. There are no studies of long-term intake of the leaf or bark in people. Repeated use of cyanide-forming plant parts is a particular concern.