Soursop Health Benefits: Nutrition, Risks and Cancer Myths

The honest answer to “what are the soursop health benefits?” is that soursop is a tropical fruit that gives you some vitamin C and fibre, and it can be enjoyed fresh as part of a varied diet. The big claims you see online, especially that it cures cancer, are not backed by evidence from people. The seeds and leaf products also raise safety questions.

This article checks the fruit properly. We start with what soursop actually is, then look at its nutrition using official data, how to eat it safely, what the Guadeloupe studies on annonacin found, and why “soursop cures cancer” is a myth. Everything here is educational, not medical advice.

What is soursop?

Soursop is the fruit of Annona muricata, a tree in the custard-apple family, Annonaceae. The fruit is easy to spot. It is green and covered in soft “spines” that are not sharp. The spines are pliable, and their tips break off easily when the fruit is fully ripe.

seeds — don’t eat!

Size varies a lot. A soursop is usually 10–30 cm long and up to about 15 cm wide, and a very large one can weigh somewhere between 4.5 and 6.8 kg. Cut one open and you find snow-white, fibrous, juicy flesh divided into segments. Each fertile segment holds one smooth, hard, black seed about 1.25–2 cm long, so a big fruit can contain anything from a few dozen to 200 or more seeds.

The smell is somewhat like pineapple, and the flavour is musky and tangy, from slightly sour to quite sharp.

The soursop tree and its flowers

The soursop tree is small and normally evergreen. It usually grows to about 7.5–9 m tall, with glossy, dark-green leaves. The fruit hangs among the foliage, which is why the tree looks so leafy even when it is carrying heavy fruit.

The flowers are borne singly. Each has three thick, fleshy outer petals that are yellow-green and three inner petals that are pale yellow. A flower must be pollinated before it can develop into fruit, and then the ovary swells into the spiky fruit you see in markets. The photographs below follow that story from the tree to the flower.

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Soursop, guanábana or graviola? One fruit, many names

Few fruits have as many names as this one. Soursop is the common English name. In Spanish-speaking countries it is guanábana. In Brazil it is graviola, in French-speaking areas corossol, and in Malaya durian belanda. All of them refer to Annona muricata.

The name matters because soursop has several close relatives in the same genus. They look similar at a glance but are different species:

That last row is a warning. “Custard apple” is applied loosely, and some older web pages call soursop a custard apple. To be sure which fruit you mean, look for the scientific name.

Where does soursop grow?

Soursop comes from the warm parts of the Americas. A record from 1526 describes it as abundant in the West Indies and northern South America. Today it is grown from southern Mexico down to Peru and Argentina. It was carried to the tropics of the Old World, so it now grows in the warm lowlands of eastern and western Africa and across south-east Asia, from south-east China to Australia. It is common in the markets of Malaya and south-east Asia, and gardeners grow it at home in southern Florida.

The common thread is warmth. Soursop is a tropical tree, which is why most people in the UK meet it as an imported fruit, a frozen pulp or a canned drink rather than something growing nearby.

Because the fruit bruises so easily, it is picked full-grown but still firm and slightly yellow-green, then left to ripen. A soft, ripe fruit is easily damaged, which is worth remembering when you shop for one.

Why does soursop attract so many health claims?

A quick search for soursop turns up “superfruit” posters, miracle-cure videos and supplements with big promises. One reason is that laboratory studies on plant extracts are easy to turn into dramatic headlines.

A good rule when you read any food-and-health page is to separate three different things:

• What the food contains. This can be measured and looked up in a food composition database.
• What an extract does in a lab dish or in animals. This is an early clue at best, not a result for people.
• What happens in people who eat it. This needs human studies, and for soursop the useful ones are few.

The rest of this article keeps those three apart. Next, we look at the first one: what a portion of soursop actually gives you.

Soursop nutrition facts (per 100 g)

Before any health claim, look at what is physically in the fruit. The US Department of Agriculture’s FoodData Central database lists raw soursop pulp, and its figures are the most reliable place to start. The box below shows the headline numbers.

Here is the fuller picture for 100 g of raw pulp, which is a little less than half a cup:

Most of soursop is water, and most of the rest is carbohydrate, including about 13.5 g of natural sugars. Protein and fat are tiny. Figures like these vary between fruits, depending on variety, ripeness and growing conditions, so treat them as a guide.

What are the real health benefits of soursop?

When people ask “is soursop good for you?”, the sensible answer is the same as for most fruit: it can be a healthy part of what you eat, because of what it contains. The soursop benefits you can actually support with data are modest and ordinary, and that is fine. They come from it being fruit, not from any magic ingredient.

A useful source of vitamin C

The NHS explains that vitamin C helps protect cells and keep them healthy. It maintains healthy skin, blood vessels, bones and cartilage, and it helps wounds heal. Adults aged 19 to 64 need 40 mg a day. Your body cannot store it, so you need some in your diet every day.

With 20.6 mg per 100 g, a 100 g serving of soursop pulp gives about half of an adult’s daily vitamin C. The NHS says a wide variety of fruit and vegetables contain it, so soursop is one option among many rather than a special case.

Fibre for your gut

Soursop has 3.3 g of fibre per 100 g. That is a worthwhile contribution from a fruit, though not a huge one. Fibre comes from plant foods, and variety is the key to a happy gut. Our guide to gut health explains why a mixed diet matters more than any single food.

It can count towards your 5 A DAY

The NHS says an adult portion of fruit is 80 g, and fresh fruit counts towards your 5 A DAY. So 80 g of ripe pulp with the seeds removed is one portion. Fruit juice and smoothies count as a maximum of one portion a day, however much you drink. We return to that in the section on juice. For the bigger picture on why variety matters, see why we need a balanced diet.

Potassium: present, but not a headline

Soursop contains 278 mg of potassium per 100 g. That sounds like a lot, but the adult reference value is 2,000 mg, so 100 g provides about 14%. We will see in a moment why that is not enough to call soursop a “source of potassium” on a label.

Try the calculator to see how the numbers change with the size of your portion.

“Superfruit”? What the label rules say

“Superfruit” has no scientific or legal meaning. It is a marketing word. But the UK does have strict rules about when a food label can say a food is a “source of” or “high in” a nutrient, and we can apply them to soursop.

• A food is a source of a vitamin or mineral if 100 g contains at least 15% of the adult reference value.
• It is high in that vitamin or mineral if it contains at least twice that, which is 30%.
• For fibre, “source of fibre” needs at least 3 g per 100 g, and “high fibre” needs at least 6 g per 100 g.

Now check soursop. The adult reference value for vitamin C is 80 mg, so:

20.6 mg ÷ 80 mg × 100 ≈ 26% of the reference value

That is above 15% but below 30%. Soursop is a source of vitamin C, but it is not “high in” or “rich in” vitamin C. With 3.3 g of fibre it is a source of fibre but not “high fibre”. And at 14%, its potassium falls below even the 15% needed to be called a source of potassium.

None of this makes soursop a bad food. It simply means that cards calling it “rich in vitamin C”, “high in fibre” or “good for heart health because of potassium” are overstating the numbers.

The science behind it: what is in the fruit?

Strip away the marketing and soursop pulp is mostly water (81.2 g in every 100 g), plus carbohydrate. Chemists group the interesting parts into a few families.

• Sugars. About 13.5 g of the 16.8 g of carbohydrate per 100 g is sugar, so roughly four-fifths of the carbohydrate is sugar. The NHS says that when fruit is blended or juiced it releases its sugars, which raises the risk of tooth decay, whereas the sugars in whole fruit are contained within the structure of the fruit. That is why it caps juice and smoothies at 150 ml a day.
• Fibre. The 3.3 g per 100 g is plant cell-wall material that your own enzymes cannot digest. It is the reason the flesh is so stringy.
• Vitamin C. This is ascorbic acid, a water-soluble vitamin. Water-soluble means it is not stored in the body, which matches the NHS advice that you need some every day. Vitamin C can also be lost when food is cooked or stored for a long time, so fresh pulp is likely to keep more of it than cooked or long-stored products.
• Plant defence chemicals. Like many plants, soursop makes chemicals that discourage insects. This is where the seeds’ insecticidal reputation comes from.

What are annonaceous acetogenins?

Memorial Sloan Kettering lists annonaceous acetogenins, found in the leaves, bark and twigs, among graviola’s active constituents. They are a family of waxy, fat-soluble compounds made by plants in the custard-apple family, and annonacin, the chemical discussed in the safety section, is one of them. Many acetogenins, including annonacin, block complex I in mitochondria, which is thought to be how they kill insects and cells in a dish and why researchers ask whether they could harm nerve cells.

The evidence ladder: dish, animal, person

Claims about soursop usually come from the bottom rung of a ladder. Each step up is harder and more trustworthy.

1. In vitro (“in glass”): chemicals tested on cells in a dish. Quick and cheap, but a dish has no digestion, no liver, no blood flow.
2. Animal studies: more realistic, but a rat is not a person, and the doses given are often much higher than anyone would get from food.
3. Human clinical trials: carefully controlled tests on people, ideally randomised and compared with a placebo. This is the rung that shows whether something helps.

For graviola, Cancer Research UK says lab extracts have affected some cancer cells but there have not been any studies in humans. The same ladder explains the safety evidence: the Guadeloupe work combines human association, cell cultures and rats, so it is a reason for caution, not a final verdict. Memorial Sloan Kettering notes it is unclear whether the neurotoxicity seen in lab and animal work applies to people.

Claims that don’t stand up

Many pages about soursop repeat claims that the data does not support. Two common examples:

• “High in vitamin E, beta-carotene and lycopene.” The USDA lists just 0.08 mg of vitamin E and 1 µg of beta-carotene per 100 g, and no lycopene at all. Those are tiny amounts.
• “Packed with antioxidants that protect against disease.” Statements like this usually rest on tests of plant extracts in laboratories. The sources used for this article do not show that eating soursop prevents or treats any disease.

Be especially wary of any page that lists soursop as a treatment for a condition and then sells a supplement. We look at the cancer claims in detail later.

Check your understanding

A 150 g serving of soursop pulp contains how much vitamin C, and what percentage of the 80 mg adult reference value is that? (2 marks)

20.6 mg × 1.5 = 30.9 mg of vitamin C. Then 30.9 ÷ 80 × 100 ≈ 39% of the reference value.

Why could soursop pulp not be described as “high in potassium”? (2 marks)

Soursop contains 278 mg of potassium per 100 g, which is 14% of the 2,000 mg reference value. “Source of” needs at least 15%, and “high in” needs at least 30%, so it meets neither.

Maths practice questions

Use the USDA figures from the table above (per 100 g raw pulp: 16.8 g carbohydrate, 13.5 g sugars, 20.6 mg vitamin C). Tap each question to reveal a worked answer.

What percentage of the carbohydrate in soursop is sugar? Give your answer to the nearest whole number. (2 marks)

13.5 ÷ 16.8 × 100 = 80.4…, so about 80%.

Example numbers: someone eats 200 g of seed-free pulp. How many grams of sugar is that, and how much vitamin C as a percentage of the NHS adult need of 40 mg? (3 marks)

200 g is 2 × 100 g. Sugar: 13.5 × 2 = 27 g. Vitamin C: 20.6 × 2 = 41.2 mg. Then 41.2 ÷ 40 × 100 = 103%. (Portion size is a made-up example.)

A study estimated 15 mg of annonacin in an average fruit and 140 µg in a cup of leaf infusion. About how many times more is in the fruit? (3 marks)

Convert to the same unit: 1 mg = 1,000 µg, so 15 mg = 15,000 µg. Then 15,000 ÷ 140 ≈ 107, so the fruit holds roughly 100 times as much as one cup of infusion. These are estimates from one 2005 study, not measurements of every fruit or cup.

How to eat soursop

The traditional way is simple: cut the ripe fruit into sections and eat the flesh with a spoon. The flesh is also added to fruit salads and desserts, and it is most widely used for drinks. It turns up in ice cream, sorbet, custard, tarts, jelly, syrup and nectar. In some regions the unripe fruit is cooked as a vegetable or put into soup.

Whichever way you eat it, ripeness matters. Soursop is picked full-grown but still firm and slightly yellow-green, and it bruises easily. It is best to eat it about five to six days after harvest. A ripe fruit yields to slight thumb pressure. The skin may darken, but the flesh stays usable. Once ripe, it keeps for another two to three days in the fridge. Our article on keeping fruit fresh explains why ripe fruit spoils so quickly and how cold storage slows it down.

What does soursop taste like?

Botanical descriptions give soursop a somewhat pineapple-like aroma and a musky flavour that runs from slightly sour to acid. In other words, it is tangy as well as sweet. Taste is personal, so descriptions vary, but the fibrous white flesh is juicy and the tang is the main thing people notice.

Soursop juice and smoothies

Soursop juice, called guanábana juice in much of Latin America, is a popular way to enjoy the fruit. If you make it at home, remember the golden rule: remove every seed before you blend. Seeds should never end up in the glass.

150 ml max

It also helps to know how the NHS counts juice. Juice and smoothies count as a maximum of one portion of your 5 A DAY, and the NHS recommends no more than 150 ml a day in total. A small glass is plenty, and the whole, seed-free pulp is the simpler choice for most meals.

• Choose a fruit that yields slightly to thumb pressure
• Wash the skin before you cut it
• Cut the fruit open lengthways
• Scoop out the flesh with a spoon
• Remove every black seed
• Blend only seed-free pulp
• Eat ripe fruit within two to three days, keeping it in the fridge
• Eat only the pulp, not the seeds or the skin

Soursop side effects and safety

Soursop is a food, and Cancer Research UK says it is unlikely that drinks or foods containing graviola could harm you when taken as part of a normal diet. The safety questions concern three other things: the seeds, large regular amounts eaten over long periods, and leaf products such as tea and supplements, which we cover below. Cancer Research UK also notes that one study of Caribbean people who ate large amounts of graviola found they were more likely to develop certain nerve changes.

Are soursop seeds poisonous?

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Yes, they should be treated as poisonous. Botanical descriptions call the seeds “somewhat toxic”, and the oil in them is described as an irritant poison. For that reason, the advice is to remove all seeds before you blend or cook the fruit. Traditionally, crushed seeds and leaf decoctions have been used against head lice and bedbugs, which tells you something about their chemistry: they are insecticidal.

Never chew the seeds. If someone swallows seeds and feels unwell, contact NHS 111 or your GP, or call 999 if they are seriously ill.

Annonacin and the Guadeloupe studies

The most serious safety question about soursop comes from the French Caribbean island of Guadeloupe. In 1999, doctors Caparros-Lefebvre and Elbaz reported in The Lancet on 87 patients with parkinsonism seen between September 1996 and August 1998. Of these, 22 had Parkinson’s disease, 31 had progressive supranuclear palsy (PSP), 30 had atypical parkinsonism, and 4 had atypical parkinsonism with motor neurone disease.

The patients with PSP or atypical parkinsonism had eaten significantly more fruit from the custard-apple family, including soursop and sugar apple, and drunk more herbal tea than the Parkinson’s patients and the comparison group. This was a case-control study, so it shows an association, not proof of cause.

A 2008 paper in Movement Disorders by Lannuzel and colleagues added more. In Guadeloupe, atypical parkinsonism made up about two-thirds of all parkinsonism cases, compared with about 5% in European countries. The researchers suggested a close association with regular soursop consumption. They also pointed to a chemical called annonacin, found in soursop fruit and leaves, as a probable cause. It was identified in experiments on midbrain cell cultures, and rats given annonacin continuously through implanted minipumps developed brain lesions like those seen in the human disease.

A 2005 study in the same journal estimated how much annonacin people might take in. An average fruit was estimated to contain about 15 mg, a can of commercial nectar 36 mg, and a cup of leaf infusion or decoction 140 µg. The authors calculated that an adult eating one fruit or drinking one can of nectar a day would, over a year, take in the amount of annonacin that caused brain lesions in rats given it into the bloodstream. That compares eating with a dose infused into rats’ veins, so it shows why researchers were concerned, not that eating soursop damages the brain.

What should you take from all this? First, these are studies of association, with animal and cell-culture work behind it, not proof that soursop causes disease in people. Second, the people studied in Guadeloupe ate soursop regularly over long periods, not as an occasional treat. Third, the concern is greatest for large, frequent amounts, and for leaf teas and supplements, where there is little safety evidence. That is why you will see cautious advice about regular, heavy use rather than a ban on the occasional ripe fruit.

Fact or myth?

Flip each card to check your answer.

🟢“Soursop flesh is green.”

Myth. The flesh is snow-white and fibrous. The green is the skin.

🌰“Soursop seeds are safe to blend.”

Myth. The seeds are described as somewhat toxic. Remove them all first.

🍊“100 g gives about half an adult’s daily vitamin C.”

Fact. 20.6 mg is about half of the 40 mg the NHS says adults need each day.

🌾“Soursop is high in fibre.”

Myth. 3.3 g per 100 g makes it a source of fibre, but “high fibre” needs 6 g.

🏷️“Graviola is another name for soursop.”

Fact. Graviola is the Brazilian name for Annona muricata.

💉“Soursop is 10,000 times stronger than chemotherapy.”

Myth. Fact-checkers rated this claim false.

Soursop leaf tea and graviola supplements

not a medicine

The leaves of the soursop tree are dried and sold as “graviola tea”, or ground into capsules and powders. These are not the same thing as eating ripe fruit. Leaf products are sold as supplements or herbal remedies rather than as food, and the Guadeloupe researchers found annonacin in the leaves as well as the fruit. Memorial Sloan Kettering notes that herbal supplements are stronger than the herbs you would use in cooking. The patients in the 1999 study also drank more herbal tea than the comparison group.

Memorial Sloan Kettering Cancer Center, which reviewed the evidence on graviola (updated April 2026), notes that human studies are lacking. It says that in animal studies graviola lowered blood pressure and blood sugar and may have additive effects with medicines for blood pressure and diabetes, although how much that matters in people is not yet known. It also advises avoiding graviola before imaging tests such as PET scans, and talking to a healthcare provider before taking any supplement.

The NHS gives general advice for all herbal medicines that applies here:

• Tell any doctor or healthcare professional treating you if you take a herbal medicine.
• If you already take other medicines, including ones bought without a prescription, check with a pharmacist first. The NHS gives statins, antidepressants, diabetes and blood-pressure medicines, blood thinners such as warfarin and hormonal contraception as examples that do not mix well with herbal medicines.
• Herbal medicines are not recommended for children, and should not be taken if you are pregnant or breastfeeding.
• People with kidney or liver problems are advised against them.
• Look for the MHRA traditional herbal registration (THR) mark and product code on the pack.

This article does not give amounts or recipes for leaf tea, because the evidence does not support recommending any.

Does soursop cure cancer?

No. This is the most important question on the whole page, so here is the evidence.

Cancer Research UK says that extracts of graviola have killed some cancer cells (liver, breast and prostate) in the lab, “but there have not been any studies in humans”. It states plainly that there isn’t reliable scientific evidence that graviola works as a cancer treatment. Memorial Sloan Kettering says there is no proof that it benefits cancer patients.

The authorities have also acted against sellers. In September 2008 the US Federal Trade Commission announced 11 law-enforcement actions against sellers of bogus cancer cures. One company sold an extract of the soursop (guanábana) tree claimed to prevent and treat melanoma. The FTC said there was no credible scientific evidence that any of the products marketed by these companies could prevent, cure or treat cancer. In April 2017 the US Food and Drug Administration sent a warning letter to a Florida company selling sour sop capsules, tea bags and leaves with claims such as “Cancer Killing Properties”. The FDA said they were unapproved “new drugs”. And the viral claim that soursop is “10,000 times stronger than chemotherapy” was rated false by AAP FactCheck in 2024.

Why a result in a lab dish is not a cure

If extracts killed cancer cells in a dish, why does that not count? Because many substances kill cells in a dish, including bleach, and that does not make them medicines. A real treatment has to kill the right cells without harming the rest of the body, reach the tumour at a safe level, and then be shown to help people in properly designed clinical trials. That is the scientific method at work: a promising early result is a hypothesis to test, not a conclusion. Our guide on how to use the scientific method shows how this works.

Another example is cyanide, which kills cells by blocking cellular respiration in the mitochondria. Something that kills cells is not automatically a medicine.

Who should be careful with soursop?

For most people, a bowl of ripe, seed-free soursop is just fruit. Take extra care in these situations:

• If you take medicines for blood pressure or diabetes. Cancer Research UK says animal studies suggest graviola may lower blood sugar and blood pressure, and Memorial Sloan Kettering warns of possible additive effects. Talk to your GP or pharmacist first.
• If you are pregnant or breastfeeding. The NHS says herbal medicines should not be taken.
• If you have kidney or liver problems. The NHS advises against herbal medicines, and Cancer Research UK says graviola may damage the kidneys and liver if taken frequently.
• If you have a movement disorder. Cancer Research UK says graviola may cause nerve changes and movement disorders. Ask your doctor.
• If you are having cancer treatment or a PET scan. Speak to your cancer team before using any graviola product.

The calm summary is this: enjoy the pulp as fruit, leave out the seeds, and be cautious with tea, capsules and large regular amounts.

Frequently asked questions about soursop health benefits

What is soursop good for?

Soursop is a fruit that provides some vitamin C and fibre, with 20.6 mg and 3.3 g per 100 g of raw pulp. It can count towards your 5 A DAY as part of a varied diet. It has not been shown to prevent or treat any disease, and the seeds should never be eaten.

Is soursop good for you?

Seed-free soursop pulp eaten occasionally is unlikely to cause harm for most people, but it is not a special health food, and the Guadeloupe studies concern regular, long-term eating. It is a source of vitamin C and fibre but not high in either. Cancer Research UK says foods and drinks containing graviola are unlikely to harm you as part of a normal diet.

Does soursop cure cancer?

No. Cancer Research UK says extracts have killed some cancer cells in the lab, but there have been no studies in humans, and there is no reliable evidence graviola works as a treatment. Memorial Sloan Kettering also finds no proof of benefit. Never stop prescribed cancer treatment for an unproven remedy.

Are soursop seeds poisonous?

Treat them as poisonous. Botanical descriptions call the seeds somewhat toxic and the seed oil an irritant poison, and they have traditionally been used against head lice and bedbugs. Remove every seed before eating, cooking or blending the fruit, and do not chew them.

Is soursop tea safe to drink?

The evidence does not support recommending it. Annonacin has been found in the leaves, and Memorial Sloan Kettering notes possible additive effects with blood-pressure and diabetes medicines. The NHS says herbal medicines should not be taken in pregnancy or when breastfeeding. Check with your GP or pharmacist first.

Can soursop cause Parkinson’s disease?

Studies in Guadeloupe linked regular soursop eating with atypical parkinsonism, which differs from Parkinson’s disease, and suggested annonacin as a probable cause. These are association studies with cell and animal work behind them, not proof in humans. Concern is greatest for large, regular amounts eaten over long periods.

What does soursop taste like?

Botanical descriptions give soursop a somewhat pineapple-like aroma and a musky flavour that ranges from slightly sour to acid. The flesh is white, fibrous and juicy. Many people describe it as tangy and sweet, but taste varies with ripeness and variety.

How do you know when a soursop is ripe?

A ripe soursop yields to slight thumb pressure. The skin may darken, but the flesh stays usable. Fruit is picked firm and is best eaten about five to six days after harvest. Once ripe, it keeps for another two to three days in the fridge.

Is graviola the same as soursop?

Yes. Graviola is the Brazilian name for Annona muricata, the same plant known as soursop in English and guanábana in Spanish. Graviola supplements can be made from leaves, stems or fruit powder rather than fresh pulp, so a label with that name describes a different product.