Short answer
Soursop leaf (Annona muricata, also called graviola or guanábana) is a tropical tree leaf traditionally brewed as a tea for stress, sleep, digestion and general wellbeing. Most research is in cell cultures and animals, with promising lab findings and no human trials showing it treats any disease. It also contains annonacin, a compound linked to nerve damage in the lab and to atypical parkinsonism in people who consume a lot of it, so it is best treated as an occasional tea. [1] [2] [3] [4]
Key takeaways
- Traditional use is real and widespread: soursop leaf tea is used across Latin America, the Caribbean, Africa and Southeast Asia for relaxation, sleep, digestion and blood sugar. [1]
- The research is mostly cells and animals. A review of 49 studies found anticancer work was the largest share (25%), followed by antiulcer (17%) and antidiabetic (14%), almost all outside human trials. [1]
- There are no clinical trials showing soursop treats or cures cancer. Reviews describe lab promise and call for human studies. [5] [2]
- The real caution is neurological: annonacin harms nerve cells in the lab and rat studies, and herbal tea from Annonaceae plants was linked to worse outcomes in people with degenerative parkinsonism. [3] [4]
- A conservative approach: occasional use, not an everyday habit, and skip it entirely with Parkinson's disease or parkinsonism.
Soursop is one of the most hyped plants on social media, usually with the word cancer attached to it. The truth is more interesting and more careful than the clips suggest, and part of it is a safety story that most of those clips leave out.
We sell soursop leaf. That is exactly why we think you should see the evidence, including the uncomfortable part, before you decide whether and how to use it.
What is soursop (graviola)?
Soursop is the fruit of Annona muricata, a small evergreen tree of the Annonaceae family native to tropical Latin America and now grown across the tropics. It is known as guanábana in Spanish, graviola in Portuguese and Brazil, and soursop in English. The fruit is large, spiny-skinned and sweet-tart, eaten fresh or turned into juices and ice cream. This guide is about the leaf, which is the part used as tea.
Chemically the plant is known for annonaceous acetogenins, a family of compounds that includes annomuricins and annonacin, along with alkaloids such as coreximine and reticuline, flavonoids such as quercetin, and vitamins. [1] The acetogenins drive most of the interest in the plant, both the research excitement and the safety concern.
Traditional uses of soursop leaf
Leaf infusions and decoctions are a household remedy across many cultures. A 2023 review of graviola's antioxidant potential describes leaves used for insomnia, diabetes, cystitis and headaches, crushed seeds used against parasites, and the fruit eaten in drinks and sweets. [6]
As always, traditional use tells you why researchers got curious. It does not tell you whether a use works or whether it is safe over time.
What the research says about soursop benefits
A 2022 review gathered 49 research articles published from 1981 to 2021. By share of studies, the activities reported for Annona muricata were anticancer (25%), antiulcer (17%), antidiabetic (14%), antiprotozoal (10%), antidiarrheal, antibacterial and antiviral (8% each), antihypertensive (6%) and wound healing (4%). Most were tested in vitro (in cells) or in animals. [1]
Blood sugar and blood pressure (animal and lab work)
In diabetic mice, a graviola extract reduced hyperglycemia-related liver damage. [7] In lab assays, soursop leaf fractions inhibited carbohydrate-digesting enzymes (alpha-amylase and alpha-glucosidase) and showed antioxidant activity. [8] In rats given a drug that raises blood pressure, soursop leaf extract protected against hypertension and high blood lipids. [9] These are consistent signals, but they are animal and test-tube results. Nobody has shown that soursop tea lowers blood sugar or blood pressure in people, and anyone with diabetes or on blood pressure medication should not use it as a substitute.
Inflammation and pain (animal studies)
An ethanol extract of the leaves reduced pain behaviors and paw inflammation in rodents in a dose-dependent way. [10] Again: a rodent model, a leaf extract, a controlled dose.
Cancer: lab promise, no human evidence
Graviola is promoted online as a natural cancer treatment. Here is what the scientific literature actually supports. Extracts and acetogenins kill or slow some cancer cell lines in laboratory dishes, and a 2018 review in Carcinogenesis describes this potential and the mechanisms involved while stressing that safety studies matter. [5] A 2020 systematic review of safety and tolerability looked at in-vitro, animal and human studies and concluded the findings support future studies in people with cancer. [2] That is a call for research, not evidence of a treatment.
| Claim | Evidence level | What we know |
|---|---|---|
| Relaxation and sleep | Traditional use only | Widely used traditionally; no good human trials of the leaf. [6] |
| Blood sugar support | Animal and lab studies | Lower glucose markers in diabetic mice; enzyme inhibition in vitro. No human trials. [7] [8] |
| Blood pressure | Animal study | Protective effect in rats given a hypertension-inducing drug. [9] |
| Pain and inflammation | Animal studies | Dose-dependent effect in rodents. [10] |
| Cancer | Lab (cell) studies only | Cell-killing effects in dishes; no human trials; reviews call for safety and clinical studies. [5] [2] |
| Treating or curing any disease | No credible evidence | Not shown in any clinical trial. |
The safety question: annonacin and nerve cells
Here is the part we want you to read twice. Soursop contains annonacin, the main acetogenin in the plant. Annonacin is a lipophilic inhibitor of mitochondrial complex I, a basic part of how cells make energy. In rats given annonacin by infusion for 28 days, researchers found damage to nerve cells in the brain regions affected in Parkinson-type disease. They noted epidemiological links in Guadeloupe between atypical parkinsonism and fruit and herbal teas from Annonaceae plants, particularly Annona muricata. [3]
Follow-up work measured annonacin in extracts of the fruit and of the leaves, the same parts islanders consume as fruit, infusions and decoctions. [11] In 2022, researchers analyzed 180 Caribbean patients with degenerative parkinsonism and found that even low lifetime consumption of Annonaceae fruits or juices, or any consumption of Annonaceae herbal tea, was associated with more severe disease and worse cognition (odds ratios 3.76 for fruit and juice, 2.91 for herbal tea). The authors recommended more restrictive public health advice. [4] The same compound also turns up in other Annonaceae fruit such as pawpaw, where it killed cortical neurons in lab tests. [12]
To be fair to the other side of the evidence: a 2020 systematic review of 'safety and tolerability' judged the included studies as medium to high quality and concluded the plant has a generally favorable profile, while noting neurotoxic effects in the literature and that the doses and durations used in animals may not translate to humans. [2] The honest synthesis is that the risk looks tied to high, long-term exposure, and that nobody has defined a safe amount for people.
Soursop fruit and juice: the same compound, a bigger dose
Most of the safety data was gathered on people eating the fruit or drinking juice, not on leaf tea alone. In the 2022 Caribbean study, even low lifetime consumption of Annonaceae fruits or juices (more than 0.2 'fruit-years') carried higher odds of a severe disease course in people who already had parkinsonism. [4] That does not mean a person without any neurological condition who eats a piece of soursop fruit is in danger. It does mean the compound is not harmless background noise, and that fruit, juice, leaf tea and extracts all add to the same lifetime total.
How to read a soursop headline
Most soursop claims you will see online come from one of four places, and they carry very different weight. Learning to tell them apart protects you from most of the hype.
- 'Kills cancer cells' means a lab dish of isolated cells exposed to a concentrated extract or a pure acetogenin. It tells researchers where to look next. It says nothing about what happens when a person drinks tea. [5]
- 'Lowers blood sugar' usually means diabetic mice or rats given a measured extract, or an enzyme test in a test tube. [7] [8]
- 'Used for centuries' is a real record of use, and a fair reason to be curious. It is not a safety study.
- 'No side effects' is rarely true of any plant with biologically active compounds. The systematic review that judged soursop's profile favorable still listed neurotoxicity among the findings. [2]
Medications and health conditions to think about
Because animal studies show soursop leaf extracts affecting blood sugar and blood pressure, it is reasonable to assume it could add to the effect of medicines that do the same, though no human interaction studies exist. If you take diabetes medication, blood pressure medication or any medicine with a narrow safety margin, ask your pharmacist before you start. The same goes for anyone with liver or kidney disease, since the compounds are processed there, and for anyone scheduled for surgery.
How to make soursop leaf tea
Our label directions: bring 2 cups of water to a gentle boil, add 1 heaping tablespoon of soursop leaves, turn the heat off, cover and steep for 30 minutes. Strain and drink warm. We suggest taking it an hour before or after meals.
On dosage: there is no established safe or effective daily amount for soursop leaf in people. Any number you see online is a guess. Our own view, given the annonacin data, is to keep it occasional (for example a few cups in a week, with long breaks) rather than a daily routine. Our tea preparation guide covers infusion technique more generally.
How to buy soursop leaf well
- Plant and part on the label: Annona muricata leaf, not a fruit powder or capsule of unknown origin.
- Whole leaf: visible leaf you can inspect, not an unlabeled powder.
- Named origin: where it grew and who harvested it.
- Honest claims: walk away from any seller saying soursop treats cancer or any disease.
Ours is wild-harvested leaf from the Ecuadorian Amazon, gathered by Indigenous partner communities, sold as whole leaf. View Soursop.
Soursop vs other Amazonian herbs
People comparing soursop with cat's claw often want the same thing from both: an Amazonian plant with a big reputation. They are different. Cat's claw has small human trials for joint comfort; soursop does not have human trials for its main claims, and carries a specific neurological caution. [13] [2]
Frequently asked questions
What are the benefits of soursop leaf?
Traditionally it is used for relaxation, sleep, digestion and blood sugar. In research, soursop leaf shows antioxidant, anti-inflammatory and blood-sugar-related effects in cells and animals, but there are no human trials proving these benefits. [1]
Does soursop cure cancer?
Is soursop tea safe to drink every day?
Who should not drink soursop tea?
People with Parkinson's disease or parkinsonism, pregnant or nursing people, and people on blood pressure or diabetes medication unless their clinician agrees.
How do you make soursop leaf tea?
Bring 2 cups of water to a gentle boil, add 1 heaping tablespoon of leaves, turn off the heat, cover and steep for 30 minutes, then strain and drink warm.
What is the difference between soursop and graviola?
None. Soursop, graviola and guanábana are three names for Annona muricata.
What is the correct dose of soursop?
There is no established dose in people. Be skeptical of any number online. Keep use occasional and ask a clinician if you take medication.
Where can I buy soursop leaf in the USA?
Look for whole Annona muricata leaf with a named origin. Kawsaypac sells wild-harvested soursop leaf from the Ecuadorian Amazon, shipped across the USA: view Soursop.
References
- Mutakin M, Fauziati R, Fadhilah FN, et al. (2022). Pharmacological Activities of Soursop (Annona muricata Lin.). Molecules. PubMed 35208993 · DOI
- Chan WJ, McLachlan AJ, Hanrahan JR, et al. (2020). The safety and tolerability of Annona muricata leaf extract: a systematic review. J Pharm Pharmacol. PubMed 31659754 · DOI
- Champy P, Höglinger GU, Féger J, et al. (2004). Annonacin, a lipophilic inhibitor of mitochondrial complex I, induces nigral and striatal neurodegeneration in rats: possible relevance for atypical parkinsonism in Guadeloupe. J Neurochem. PubMed 14675150 · DOI
- Cleret de Langavant L, Roze E, Petit A, et al. (2022). Annonaceae Consumption Worsens Disease Severity and Cognitive Deficits in Degenerative Parkinsonism. Mov Disord. PubMed 36210778 · DOI
- Qazi AK, Siddiqui JA, Jahan R, et al. (2018). Emerging therapeutic potential of graviola and its constituents in cancers. Carcinogenesis. PubMed 29462271 · DOI
- Olas B (2023). The Antioxidant Potential of Graviola and Its Potential Medicinal Application. Nutrients. PubMed 36678273 · DOI
- Son Y, Lee H, Son SY, et al. (2021). Ameliorative Effect of Annona muricata (Graviola) Extract on Hyperglycemia Induced Hepatic Damage in Type 2 Diabetic Mice. Antioxidants (Basel). PubMed 34679681 · DOI
- Justino AB, Miranda NC, Franco RR, et al. (2018). Annona muricata Linn. leaf as a source of antioxidant compounds with in vitro antidiabetic and inhibitory potential against α-amylase, α-glucosidase, lipase, non-enzymatic glycation and lipid peroxidation. Biomed Pharmacother. PubMed 29425747 · DOI
- Nsor OO, Alabi BA, Badejo JA, et al. (2024). Soursop leaf extract and fractions protects against L-NAME-induced hypertension and hyperlipidemia. Front Nutr. PubMed 39171117 · DOI
- de Sousa OV, Vieira GD, de Jesus R G de Pinho J, et al. (2010). Antinociceptive and anti-inflammatory activities of the ethanol extract of Annona muricata L. leaves in animal models. Int J Mol Sci. PubMed 20559502 · DOI
- Champy P, Melot A, Guérineau Eng V, et al. (2005). Quantification of acetogenins in Annona muricata linked to atypical parkinsonism in guadeloupe. Mov Disord. PubMed 16078200 · DOI
- Potts LF, Luzzio FA, Smith SC, et al. (2012). Annonacin in Asimina triloba fruit: implication for neurotoxicity. Neurotoxicology. PubMed 22130466 · DOI
- Mur E, Hartig F, Eibl G, et al. (2002). Randomized double blind trial of an extract from the pentacyclic alkaloid-chemotype of uncaria tomentosa for the treatment of rheumatoid arthritis. J Rheumatol. PubMed 11950006