Soursop (Graviola): Nutrition, Benefits and Safety Warnings

Soursop (Annona muricata) grows across the Caribbean, Central and South America, West Africa and Southeast Asia. It goes by many names: graviola in Brazil, guanábana in Spanish-speaking countries, corossol in French, and guyabano in the Philippines. The fruit can weigh several pounds, with a green, prickly skin and soft, fibrous flesh that tastes like a mix of pineapple, strawberry and banana with a citrus tang.

This guide covers soursop nutrition, its real benefits, what the cancer research actually shows, the annonacin safety warning, and how to eat it. If you’re interested in its close relative, see our article on cherimoya and cancer, or browse more fruit guides.

Soursop nutrition facts

Soursop is moderately sweet and has more calories than many fruits, mostly from natural sugars. Its standout nutrients are vitamin C, fiber and copper. The table below uses USDA values for raw soursop pulp.

Source: USDA FoodData Central — Soursop, raw (SR Legacy, FDC ID 167761). % Daily Value (DV) uses FDA values for a 2,000-calorie diet.

A cup of soursop pulp provides about 46 mg of vitamin C, just over half the daily value, and 7.4 grams of fiber, more than a quarter of what most adults need. It also gives about 626 mg of potassium, similar to a medium banana and a half. It’s very low in fat and sodium.

The flip side is sugar: a cup contains about 30 grams of natural sugar. That’s fine as part of a balanced diet, but it’s worth knowing if you’re watching your blood sugar, especially if you drink soursop as a sweetened juice or nectar.

Health benefits

Most of soursop’s proven benefits come from its everyday nutrients rather than anything unique to the fruit. Each finding below carries an evidence label, explained in our editorial policy.

Vitamin C for immunity and skin Strong evidence

Vitamin C is needed for a working immune system, wound healing and making collagen, the protein that keeps skin and blood vessels strong. It also helps your body absorb iron from plant foods. One cup of soursop covers about half your daily need.

Fiber for digestion and fullness Strong evidence

Diets high in fiber are linked to regular bowel movements, healthier gut bacteria, lower cholesterol and a lower risk of heart disease and type 2 diabetes. Soursop’s soft pulp is surprisingly high in fiber for a sweet fruit, which also helps slow the release of its sugar.

Potassium for blood pressure Moderate evidence

Eating more potassium-rich foods, while cutting back on salt, helps lower blood pressure. Soursop is a good source, though people with kidney disease who need to limit potassium should check with their care team.

Antioxidant and anti-inflammatory effects Limited evidence

Soursop pulp and leaves contain polyphenols and other antioxidant compounds. Extracts reduced inflammation in some animal studies, but these haven’t been confirmed in human trials.

Blood sugar Limited evidence

Leaf extracts lowered blood sugar in diabetic rats, and soursop leaf tea is a traditional diabetes remedy in parts of the Caribbean and Africa. There’s no good human evidence. If you take diabetes medicine, these extracts could add to its effect, so check with your doctor.

Soursop and cancer: what the research shows

Soursop is one of the most heavily promoted “natural cancer cures” online. You may have seen claims that it’s “10,000 times stronger than chemotherapy”. That claim isn’t true, and it has been repeatedly debunked by fact-checkers.

Effects on cancer cells in the lab Limited evidence

Soursop leaves, seeds and fruit contain compounds called annonaceous acetogenins. In lab experiments, these compounds and soursop extracts were toxic to several types of cancer cells, including breast, prostate, liver and pancreatic cancer cells. Some animal studies also reported slower tumor growth.

The “10,000 times” figure appears to come from a lab study where one isolated acetogenin was compared with a chemotherapy drug on cancer cells in a dish. Damaging cells in a dish is very different from helping a person with cancer. Many substances, including bleach, are toxic to cancer cells in a dish.

If you or someone close to you has cancer, please don’t use soursop in place of medical treatment, and don’t stop treatment to try it. Some herbal products can also interfere with chemotherapy or affect blood tests. Tell your cancer team about any supplement you’re considering.

Annonacin and other safety warnings

The same acetogenins that are toxic to cancer cells in a dish can also damage nerve cells. The main one in soursop, annonacin, is toxic to brain cells in lab studies, where it blocks how cells make energy.

The concern comes from the French Caribbean island of Guadeloupe, which has an unusually high rate of atypical parkinsonism, a Parkinson-like illness that responds poorly to standard Parkinson’s drugs. Researchers found that people with the illness were more likely to have eaten soursop fruit or drunk soursop leaf tea regularly for many years. Lab work then found annonacin in the fruit pulp, nectar and leaves. Researchers have raised similar questions in New Caledonia and other tropical regions where the fruit and its relatives are eaten often.

This link is from observational studies, so it doesn’t prove soursop causes the illness. But it’s consistent enough that cancer and food safety experts urge caution. Occasional servings of the fruit are unlikely to cause harm. The risk, if real, seems to come from heavy, long-term use, and concentrated supplements and daily leaf teas may give much higher doses.

Stop using soursop products and see a doctor if you notice tremor, stiffness, slowed movements, balance problems or changes in thinking. See also our medical disclaimer.

How to choose and eat soursop

Fresh soursop can be hard to find outside the tropics, but you’ll often see it in Latin American, Caribbean and Asian grocers, and frozen soursop pulp is widely available.

• Choosing: a ripe soursop is dark green with a slight yellow tinge and yields to gentle pressure, like a ripe avocado. The spikes soften as it ripens.
• Ripening: leave a firm fruit at room temperature for 2 to 5 days. Once soft, eat it within a day or two, or refrigerate it briefly.
• Preparing: cut the fruit in half, scoop out the white flesh, and pick out all the black seeds. The flesh has a fibrous core you can discard.
• Eating: eat it chilled with a spoon, or blend it with milk or water to make a smoothie or the Latin American drink champola.
• Other uses: soursop makes excellent ice cream, sorbet and fruit popsicles.

Fruit, juice, tea or supplements?

How you eat soursop changes both the benefits and the risks:

Supplements aren’t approved by the FDA before they’re sold, and their labels may not reflect what’s inside.

If you enjoy the fruit, eat it as you would any other tropical fruit, a few times a month as part of a varied diet, rather than every day. For an everyday vitamin C boost, guava, kiwi, oranges and strawberries are just as rich and carry no similar concerns.

Soursop FAQ