Pawpaw Fruit: Nutrition, Cancer Claims, and the Annonacin Neurotoxicity Question (Plus Graviola)

The pawpaw (Asimina triloba) is a tropical-tasting fruit that grows wild across much of the eastern United States, with soft, custard-like flesh often compared to a blend of banana and mango. Long eaten by Native Americans and early settlers, it has recently gained popularity among foragers, chefs, and small farms. Online articles have also promoted pawpaw for its vitamins and minerals and for possible anti-cancer effects, based largely on laboratory research into compounds called acetogenins.

Pawpaw belongs to the Annonaceae family, which includes tropical fruits such as soursop (graviola), cherimoya, and sugar apple. The same family of compounds behind the cancer claims has also raised questions about neurotoxicity. This article covers pawpaw’s nutrition, what research shows about acetogenins and cancer, the safety concerns, and how to enjoy the fruit sensibly.

Is pawpaw fruit healthy, and can it fight cancer? Pawpaw is a nutritious native North American fruit, rich in vitamin C, magnesium, and antioxidants. Its compounds called acetogenins kill cancer cells in lab dishes, but there is no evidence pawpaw or its supplements treat cancer in people, and the same compounds have been linked to a Parkinson-like nerve disorder in heavy consumers of a related fruit. Enjoy the fruit; avoid concentrated extracts.

About the Pawpaw

Pawpaw trees grow in the understory of forests from the Gulf Coast to the Great Lakes and east to the Atlantic. The fruit, which ripens in late summer and early fall, is greenish-yellow, oblong, and can weigh up to a pound or more, making it the largest edible fruit native to North America. Ripe pawpaws are fragrant and soft, with yellow to orange flesh and large brown seeds. Because the fruit bruises easily and ripens quickly after harvest, it is rarely found in grocery stores, though it is increasingly sold at farmers markets, in frozen pulp, and in products such as ice cream and beer. Universities and growers have developed improved varieties for small-scale cultivation.

Is Pawpaw Fruit Nutritious?

Yes. Pawpaw is a nutrient-dense native fruit, higher in vitamin C, magnesium, iron, and several antioxidants than apples, bananas, or oranges, with a custard-like texture and tropical flavor. Pawpaw fruit is a good source of vitamin C, and contains potassium, magnesium, manganese, iron, and dietary fiber, along with antioxidant compounds. Analyses have suggested that pawpaws compare favorably with common fruits such as bananas, apples, and oranges in several minerals and in protein content, though fruit composition varies with variety, ripeness, and growing conditions. As with other fruits, pawpaw can be part of a varied diet rich in fruits and vegetables.

Can Pawpaw Cure or Fight Cancer?

No proven benefit. Pawpaw contains acetogenins that kill cancer cells in laboratory studies, but there is no clinical evidence that eating pawpaw or taking its extracts treats or prevents cancer in people. Annonaceous acetogenins are a class of compounds found in the bark, twigs, leaves, seeds, and fruit of plants in the Annonaceae family. In laboratory studies, they inhibit complex I of the mitochondrial respiratory chain, the cellular machinery that produces energy, and they have shown toxicity to a range of cancer cell lines. Researchers studied pawpaw twig extracts in the 1990s and 2000s as potential cancer treatments, and some extracts were sold as dietary supplements.

However, laboratory results do not show that eating pawpaw, or taking pawpaw or graviola extracts, treats cancer in people. Many compounds kill cancer cells in a dish but are ineffective or harmful in the body. Memorial Sloan Kettering Cancer Center’s integrative medicine service notes that graviola, a related plant, has shown activity against cancer cell lines in laboratory studies but that human studies are lacking, and that neurotoxicity seen in preclinical studies raises safety questions. No clinical trials have shown that pawpaw or graviola products improve outcomes for people with cancer, and relying on them instead of effective treatment can be dangerous, as discussed in our article on alternative cancer treatments and survival.

Is Pawpaw Linked to Nerve Damage?

Possibly in concentrated form: acetogenins similar to those in pawpaw have been linked to an atypical Parkinson-like disorder among heavy consumers of the related soursop fruit in the Caribbean, raising caution about extracts. The same mechanism that makes acetogenins toxic to cancer cells, inhibition of mitochondrial complex I, can harm nerve cells, which depend heavily on mitochondrial energy. Interest in this issue began on the Caribbean island of Guadeloupe, where doctors noticed unusually high rates of an atypical form of parkinsonism. A 1999 case-control study in The Lancet by Dominique Caparros-Lefebvre and Alexis Elbaz found that patients with atypical parkinsonism and a related condition, progressive supranuclear palsy, were more likely to have regularly consumed fruits and herbal teas from Annonaceae plants, particularly soursop, than controls.

Laboratory research followed. A 2004 study in the Journal of Neurochemistry by Pierre Champy and colleagues found that annonacin, the main acetogenin in soursop, inhibited mitochondrial complex I and, when infused into rats, caused degeneration in brain regions involved in movement. A 2012 study in Neurotoxicology by Lisa Potts and colleagues measured annonacin in pawpaw fruit pulp, finding an average of about 0.07 milligrams per gram, and showed that purified annonacin and crude pawpaw fruit extract were toxic to cultured cortical neurons. The authors concluded that pawpaw fruit contains a high concentration of annonacin that is toxic to neurons in the laboratory.

These findings do not prove that eating pawpaw fruit causes neurological disease in people. The Guadeloupe findings involved frequent, long-term consumption of soursop fruits and teas, and laboratory concentrations do not directly translate to dietary exposure. But they provide a reason for caution, particularly with concentrated extracts, supplements, teas made from leaves, and frequent heavy consumption.

Pawpaw in History

Native American peoples across the eastern woodlands ate pawpaws and used the tree’s inner bark for cordage. European settlers adopted the fruit, and pawpaws appear in accounts from early American history; members of the Lewis and Clark expedition relied on pawpaws for food during part of their return journey in 1806. Thomas Jefferson grew pawpaws at Monticello. The fruit was once widely known in rural communities in the eastern United States, with many places named after it, including towns and creeks called Pawpaw or Paw Paw. Its popularity declined as commercial fruits shipped long distances became available, partly because pawpaws do not ship or store well.

Growing Pawpaws

Pawpaw trees are hardy in much of the eastern United States and are increasingly planted by home gardeners and small farms. They grow as understory trees and can tolerate shade when young, though they fruit best with more sun. Most pawpaws are not self-fertile, so planting at least two genetically different trees, such as two named varieties, improves fruit set. Their maroon flowers are pollinated mainly by flies and beetles rather than bees, and some growers hand-pollinate to increase yields. Improved varieties developed by breeders and universities offer larger fruit with fewer seeds and better flavor. Pawpaw leaves contain natural compounds that deter many pests, and the trees are the only host plant for the caterpillars of the zebra swallowtail butterfly.

How Do You Eat and Store Pawpaw?

Pawpaw is eaten fresh when soft and ripe, scooped from the skin and seeds, or used in desserts; it bruises easily and spoils fast, so it is rarely sold in stores and best eaten quickly or frozen. Pawpaws are ripe when they yield to gentle pressure, similar to a ripe peach or avocado, and often develop a strong fruity aroma. Ripe fruit lasts only a few days at room temperature and about a week in the refrigerator. The pulp can be scooped out, separated from the seeds, and frozen for later use. Pawpaw is usually eaten fresh or used in uncooked or lightly cooked desserts, because prolonged heating can change its flavor. Popular uses include ice cream, smoothies, puddings, quick breads, and beer brewed by craft breweries in pawpaw-growing regions. Because seeds should not be eaten, they should be removed carefully before blending.

More on the Guadeloupe Findings

Neurologists continued to study the unusual parkinsonism in Guadeloupe after the 1999 report. A 2007 study in the journal Brain by Annie Lannuzel and colleagues classified patients into groups including a progressive supranuclear palsy-like syndrome and a parkinsonism-dementia complex and found that these atypical forms shared features suggesting a common environmental risk factor, with consumption of Annonaceae products examined as a candidate. These forms of parkinsonism respond poorly to levodopa, the main Parkinson’s drug, and often involve cognitive problems. The researchers’ findings strengthened concerns about long-term, heavy consumption of soursop fruit and leaf teas but did not establish a precise safe level of intake.

Whether similar risks apply to pawpaw is unknown. Pawpaw contains annonacin at concentrations comparable to soursop in laboratory measurements, but pawpaw is typically eaten seasonally and in smaller amounts in North America, and no studies have linked pawpaw consumption to neurological disease in people. Researchers have called for more study, particularly as pawpaw products such as frozen pulp make year-round consumption easier.

Are Pawpaw Supplements Worth Taking?

Pawpaw extracts are marketed for cancer and parasites, but they lack evidence of benefit and may carry the neurotoxicity risk linked to concentrated acetogenins, so they are best avoided. Much of the research on pawpaw acetogenins was led by Jerry McLaughlin, a pharmacognosist at Purdue University, who identified many acetogenins and helped develop a standardized pawpaw twig extract sold as a dietary supplement. His 2008 review in the Journal of Natural Products described the path from discovery to commercial products and reported that some cancer patients had used the extract, but this reflected anecdotal experience rather than controlled clinical trials. Under U.S. law, supplements cannot be marketed as cancer treatments, and the Federal Trade Commission has taken action against companies making unsupported cancer claims for herbal products. People considering such products should discuss them with their oncology team, both because of the lack of proven benefit and because supplements can interact with cancer treatments.

Pawpaw’s Growing Popularity

Interest in pawpaws has grown as part of broader enthusiasm for foraging, native plants, and local foods. Festivals celebrating the fruit, such as the long-running Ohio Pawpaw Festival, draw visitors each September with tastings, cooking contests, and growers’ displays. Chefs in the eastern United States feature pawpaw in seasonal desserts, and some small farms sell fresh fruit and frozen pulp. Because pawpaws are rarely sprayed with pesticides and grow well without intensive management, they appeal to organic and low-input growers. Kentucky State University has maintained a research program on pawpaw breeding and cultivation, helping growers develop the crop commercially.

Pawpaw in the Ecosystem

Pawpaw trees often grow in patches, called groves, that spread through root suckers, creating colonies of genetically identical trees. Their large leaves and natural chemical defenses deter many insects and browsing animals such as deer, which is one reason pawpaw groves can thrive in forests where deer have reduced other understory plants. The zebra swallowtail butterfly depends on pawpaw leaves for its caterpillars, which absorb acetogenins that may make them unpalatable to predators. Wild animals including raccoons, opossums, foxes, and birds eat the ripe fruit and help disperse seeds.

Reactions and Sensitivities

Most people tolerate pawpaw fruit flesh, but some experience digestive upset, including nausea, vomiting, or diarrhea, after eating it, sometimes even after small amounts. Handling the fruit or leaves can cause skin irritation or rash in sensitive individuals. People trying pawpaw for the first time may want to start with a small portion. Anyone who develops symptoms such as hives, swelling, or difficulty breathing after eating any new food should seek medical care.

Pawpaw, Graviola, and Related Fruits

Fruit	Where it grows	Notes
Pawpaw (Asimina triloba)	Eastern North America	Seasonal fruit; contains annonacin
Soursop / graviola (Annona muricata)	Tropical Americas, Africa, Asia	Fruit, juices, leaf teas, and supplements; linked to Guadeloupe parkinsonism study
Cherimoya (Annona cherimola)	Andean regions, subtropics	Popular dessert fruit
Sugar apple (Annona squamosa)	Tropics	Sweet fruit; seeds not eaten

How to Enjoy Pawpaw Sensibly

Eat the flesh, not seeds or skin. Pawpaw seeds and skin contain higher levels of acetogenins and other compounds; seeds should not be chewed or eaten.

Enjoy in moderation. Eating pawpaws during their short season is a long-standing tradition; frequent, heavy consumption over long periods is a different matter.

Avoid concentrated extracts. Pawpaw and graviola supplements, extracts, and leaf teas deliver concentrated compounds without proven benefit and with potential risks.

Watch for reactions. Some people experience nausea, vomiting, or allergic skin reactions after eating pawpaw or handling the fruit.

Talk to a clinician if you have cancer or a neurological condition. Discuss any supplements, especially those marketed for cancer.

Foraging for Wild Pawpaws

Many people encounter pawpaws while foraging in woods and river bottomlands. Pawpaw trees are recognizable by their large, drooping, oblong leaves, which can be up to a foot long and have a smell some compare to green pepper when crushed. Fruit often hangs in clusters and ripens from late August through October depending on location. Ripe fruit may fall to the ground or come off with a gentle tug. Foragers should obtain permission on private land, follow rules on public lands, and leave fruit for wildlife. Because pawpaws are distinctive, they are rarely confused with toxic look-alikes, but anyone foraging should be certain of identification before eating any wild plant.

What Researchers Still Need to Learn

Several important questions about pawpaw remain unanswered. Researchers do not know how much annonacin people absorb from eating pawpaw fruit, how it is metabolized, or whether occasional seasonal consumption carries any measurable neurological risk. Annonacin levels may vary by variety, ripeness, growing conditions, and processing, and frozen pulp or products such as ice cream and beer may contain different amounts than fresh fruit. Long-term studies of people who regularly eat pawpaws have not been done. Researchers have also called for better data on acetogenin content in commercial graviola and pawpaw supplements, which can vary widely. Answering these questions would help consumers and regulators make better-informed decisions.

Comparing Pawpaw With Common Fruits

Nutrition analyses suggest pawpaw provides vitamin C at levels comparable to or higher than apples and bananas, along with notable amounts of potassium, magnesium, manganese, and iron, and some protein. Its caloric content is similar to that of bananas. Like other fruits, it provides fiber and antioxidant compounds. These nutrients can be obtained from many fruits and vegetables, so pawpaw is best viewed as a flavorful seasonal addition to a varied diet rather than a uniquely powerful health food. Comparisons depend on the specific analyses, varieties, and ripeness, and pawpaw has not been studied as extensively as common commercial fruits.

Putting Plant Toxins in Perspective

Many familiar foods contain natural compounds that can be harmful in large amounts or with certain preparation. Green or sprouted potatoes contain glycoalkaloids such as solanine; cassava contains cyanogenic compounds that must be removed through processing; raw kidney beans contain lectins that are destroyed by thorough cooking; and apricot kernels release cyanide. In each case, safe use depends on the amount eaten, preparation, and frequency. Pawpaw’s annonacin fits this pattern: the fruit has been eaten for centuries, yet laboratory evidence suggests caution about heavy, long-term consumption and concentrated products. Recognizing this helps avoid both alarmism and the assumption that anything natural is harmless.

A Note for People With Neurological Conditions

Because annonacin targets the same mitochondrial pathway implicated in some forms of parkinsonism, people with Parkinson’s disease or other neurodegenerative conditions may reasonably choose to avoid pawpaw, soursop, and related products, or discuss them with their neurologist. There is no evidence that occasional pawpaw consumption causes or worsens these conditions in people, but given the laboratory findings and the Guadeloupe experience, caution is a reasonable personal choice.

Pawpaw Products on the Market

As interest grows, pawpaw appears in more products: frozen pulp sold by small farms and specialty retailers, seasonal ice creams and gelatos, baked goods, jams, and craft beers. Some nurseries sell grafted trees of named varieties for home growers. Processed products extend the short season but may change exposure patterns, since people can consume pawpaw more often and in larger amounts. Producers rarely measure annonacin, and no regulatory limits exist. Consumers who enjoy pawpaw products can treat them like other seasonal treats rather than daily staples, an approach consistent with current uncertainties.

Graviola Supplements in Detail

Graviola is sold as capsules of leaf or fruit powder, liquid extracts, and teas, often marketed for immune support or cancer. Products vary widely in composition and potency, and labels rarely state acetogenin content. Besides neurotoxicity concerns, laboratory and animal studies have raised questions about effects on blood pressure and blood sugar, so graviola might interact with medications for these conditions. Memorial Sloan Kettering advises that patients discuss graviola with their healthcare team, particularly during cancer treatment. Because graviola is marketed largely through online retailers and international sellers, quality control can be inconsistent.

Cooking and Preparing Pawpaw Safely

To prepare pawpaw, cut the fruit in half lengthwise and scoop out the flesh with a spoon, removing the large seeds whole without crushing them. Some people press the pulp through a food mill or sieve to separate seeds and fibers, which also produces a smooth puree for desserts. Discard the skin. Because heating changes pawpaw’s delicate flavor, many recipes add the pulp after cooking or use it in chilled dishes. Frozen pulp should be thawed in the refrigerator and used promptly. Wearing gloves when handling large quantities may help people prone to skin irritation from the fruit or leaves.

Pawpaw Compared With Its Tropical Relatives

Pawpaw is the northernmost member of a largely tropical family. Its flavor resembles some tropical relatives, and like them it contains acetogenins. Soursop is consumed in much larger quantities in parts of the Caribbean, Latin America, and Asia, often as juice and leaf tea, which is part of why concerns have focused on it. Cherimoya and sugar apple are widely enjoyed as fruits, and their seeds, like pawpaw seeds, should not be eaten. Researchers have measured acetogenins in several of these fruits, with levels varying among species and parts of the plant.

Common Myths

“Pawpaw is the same as papaya.” In some countries papaya is called pawpaw, but the North American pawpaw (Asimina triloba) is a different plant in a different family.

“Pawpaw extract cures cancer.” Laboratory findings have not translated into proven treatments; no clinical trials show benefit.

“Natural fruits can’t be harmful.” Many plants contain compounds that can be harmful at high doses or with long-term use, including some in the Annonaceae family.

“Graviola tea is a safe daily tonic.” Leaf teas and supplements concentrate acetogenins; heavy, long-term use has been linked to neurological concerns.

Key Terms

Acetogenins: Compounds in Annonaceae plants that inhibit mitochondrial complex I.

Annonacin: The main acetogenin studied for neurotoxicity, found in soursop and pawpaw.

Mitochondrial complex I: A key enzyme in cellular energy production.

Atypical parkinsonism: Movement disorders resembling Parkinson’s disease but with different features and poor response to standard treatment.

Annonaceae: The plant family that includes pawpaw, soursop, cherimoya, and sugar apple.

The Bottom Line

Pawpaw is a distinctive native fruit with tropical flavor and useful nutrients, and enjoying the ripe flesh during its short season is a long tradition in eastern North America. Claims that pawpaw or its relative graviola treat cancer are based on laboratory studies of acetogenins, not clinical evidence. The same compounds, particularly annonacin, are toxic to nerve cells in laboratory and animal studies, and heavy consumption of related plants has been linked to atypical parkinsonism in Guadeloupe. Eating the fruit occasionally, avoiding seeds and skin, and steering clear of concentrated extracts and supplements are sensible precautions.

Key Facts at a Glance

Pawpaw (Asimina triloba) is the largest edible fruit native to North America, ripening in late summer and early fall across the eastern United States. A 2012 study measured an average of about 0.07 milligrams of annonacin per gram of pawpaw pulp and found pawpaw extracts toxic to cultured neurons. Annonacin induced brain degeneration in rats in a 2004 study, and a 1999 case-control study in Guadeloupe linked atypical parkinsonism to frequent consumption of soursop and other Annonaceae products. Acetogenins have shown activity against cancer cells in the laboratory, but no clinical trials show benefit in people. Seeds and skin should not be eaten.

These findings support enjoying pawpaw as an occasional seasonal fruit while avoiding concentrated extracts, supplements, and leaf teas.

Questions to Ask Before Taking a Pawpaw or Graviola Supplement

What evidence supports the claimed benefit, and was it tested in people? How much of the active compounds does the product contain, and is it standardized? Has the product been tested by an independent laboratory for contents and contaminants? Could it interact with medications, including cancer treatments? Does my doctor or oncology team know I am considering it? Products that claim to treat cancer should be viewed with particular skepticism, since such claims are not permitted for dietary supplements in the United States.

Further Reading

Memorial Sloan Kettering Cancer Center’s About Herbs database summarizes evidence on graviola and other botanicals. University extension programs in pawpaw-growing states provide guidance on growing and harvesting pawpaws. Peer-reviewed studies cited in this article describe the research on acetogenins and neurotoxicity.

Pawpaw and Wildlife Gardening

Gardeners interested in native plants often grow pawpaws to support wildlife. Beyond hosting zebra swallowtail caterpillars, pawpaw groves provide shade and shelter, and their fruit feeds mammals and birds in late summer. Because pawpaws spread by root suckers, they can form thickets that help stabilize stream banks. Native plant societies and extension services in pawpaw-growing states can recommend varieties and planting locations. Growing pawpaws for wildlife and occasional fruit is compatible with the cautious approach to heavy consumption described in this article, and it supports the conservation of a native species with a long cultural history in North America.

Storage Life Compared With Other Fruits

Pawpaw’s short shelf life is its main commercial limitation. Ripe pawpaws typically last two to three days at room temperature and up to about a week refrigerated, far shorter than apples or citrus. Fruit picked slightly underripe can ripen at room temperature and be held briefly in cold storage, and researchers have studied harvest timing and cooling to extend shelf life. Until storage improves, most people will find pawpaws at farmers markets, through local growers, or in the wild, and frozen pulp offers the most practical way to enjoy the flavor outside the season.

Growers and university breeders continue to evaluate varieties for longer storage, firmer flesh, and better shipping quality.

Frequently Asked Questions

Is pawpaw fruit good for you?

Yes. Pawpaw is a nutritious native North American fruit with a custard-like texture and tropical flavor. It is higher in vitamin C, magnesium, iron, and several antioxidants than common fruits like apples and bananas. As a whole fresh fruit, it is a healthy, if hard-to-find, addition to the diet.

Can pawpaw cure cancer?

No. Pawpaw contains compounds called acetogenins that can kill cancer cells in laboratory dishes, which has fueled marketing claims, but there is no clinical evidence that eating pawpaw or taking pawpaw extracts treats or prevents cancer in people. People with cancer should rely on proven treatments and not substitute unproven supplements.

Is pawpaw safe to eat?

The ripe fruit is safe for most people to eat in normal amounts, though some experience mild stomach upset or, rarely, skin reactions. The bigger concern is with concentrated extracts: acetogenins similar to pawpaw’s have been linked to a Parkinson-like nerve disorder in heavy consumers of the related soursop fruit, so supplements warrant caution.

Are pawpaw supplements or extracts worth taking?

Not based on current evidence. Pawpaw extracts are sold for cancer, parasites, and other uses, but there are no rigorous human studies showing they work, and the concentrated acetogenins they contain may carry a neurotoxicity risk. Enjoying the whole fruit is reasonable; taking high-dose pawpaw supplements is not supported and is best avoided.

Why don’t grocery stores sell pawpaw?

Pawpaws bruise easily and spoil within days of ripening, which makes them very difficult to ship and store commercially. As a result, they are rarely found in supermarkets and are usually available only from farmers markets, local growers, or backyard trees in parts of the eastern United States during their short late-summer and fall season.

References

1. Potts LF, Luzzio FA, Smith SC, et al. Annonacin in Asimina triloba fruit: implication for neurotoxicity. Neurotoxicology. 2012;33(1):53–58. PMID 22130466
2. Champy P, Höglinger GU, Féger J, et al. Annonacin, a lipophilic inhibitor of mitochondrial complex I, induces nigral and striatal neurodegeneration in rats: possible relevance for atypical parkinsonism in Guadeloupe. Journal of Neurochemistry. 2004;88(1):63–69. PMID 14675150
3. Caparros-Lefebvre D, Elbaz A. Possible relation of atypical parkinsonism in the French West Indies with consumption of tropical plants: a case-control study. Lancet. 1999;354(9175):281–286. PMID 10440304
4. Memorial Sloan Kettering Cancer Center. Graviola. About Herbs, Botanicals & Other Products. mskcc.org
5. Lannuzel A, Höglinger GU, Verhaeghe S, et al. Atypical parkinsonism in Guadeloupe: a common risk factor for two closely related phenotypes? Brain. 2007;130(Pt 3):816–827. PMID 17303592
6. McLaughlin JL. Paw paw and cancer: annonaceous acetogenins from discovery to commercial products. Journal of Natural Products. 2008;71(7):1311–1321. PMID 18598079

Last updated: October 6, 2026