What the evidence says. Early or small human trials; promising but not yet conclusive.
Nutrition per serving 1 medium (155 g)
Water113.5 g74%
Sugars28 g18%
Fibre6.8 g4%
Other carbs1.8 g1%
Protein3.2 g2%
Fat0.5 g0%
What's in one serving, by weight — average composition (USDA).One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.
Sugar Apple (Custard Apple) (Annona squamosa) is a fruit used for good source of vitamin c and dietary fiber (whole-food nutrition). NutriDex grades the human evidence as Preliminary. Sugar apple is a nutritious tropical fruit, supplying meaningful vitamin C, fiber, vitamin B6 and potassium per serving, so its core value is as whole-food nutrition. The popular medicinal claims — antidiabetic, antioxidant, lipid-lowering, antihypertensive and anticancer effects — rest almost entirely on in vitro work and rodent studies of leaf, bark or seed extracts, not the edible pulp, and there are essentially no rigorous human randomized trials of the fruit. Repeated animal studies do show that aqueous and ethanolic leaf extracts lower fasting glucose and improve lipid profiles in diabetic rats and rabbits, which is consistent across labs but not validated in people. The most important human-relevant signal is a safety concern rather than a benefit: the genus Annona is rich in annonaceous acetogenins (annonacin, squamocin), potent mitochondrial complex I inhibitors that are neurotoxic in cell and rodent models. Epidemiology and a 180-patient Caribbean cohort link consumption of Annonaceae fruit, juice and herbal tea to worse, often levodopa-unresponsive atypical parkinsonism and greater cognitive impairment, even at relatively low cumulative intake. Acetogenins are concentrated in the seeds, peel and leaves, with smaller amounts in pulp, so occasional whole-fruit eating is generally considered low risk while heavy or daily consumption — and especially seed/leaf preparations — is not. Overall the human evidence is preliminary: enjoy the fruit as food, but treat therapeutic and "superfood" claims as unproven.
Purported Benefits
✓Good source of vitamin C and dietary fiber (whole-food nutrition)
✓Antioxidant capacity from polyphenols and ascorbate (mostly in vitro)
✓Antidiabetic / blood-glucose-lowering effect of leaf extracts (animal models only)
✓Lipid-profile improvement (lower cholesterol/triglycerides in diabetic rodents)
✓Anticancer/cytotoxic activity of seed acetogenins (cell and animal studies only)
✓Traditional antimicrobial and anti-inflammatory uses (preclinical)
Dosing & Compounds
Typical Dose
1 medium fruit (about 155 g edible pulp); the seeds, peel, leaves and roots should not be eaten.
Active Compounds
Annonaceous acetogenins (annonacin, squamocin, bullatacin) — mitochondrial complex I inhibitors / neurotoxinsIsoquinoline alkaloids (anonaine, higenamine, reticuline)Vitamin C (ascorbic acid)Dietary fiber (soluble and insoluble)Flavonoids and phenolic acids (quercetin, rutin, gallic/caffeic acid)Diterpenes and kaurane-type terpenoidsPotassium and magnesium (electrolyte minerals)B-vitamins (thiamin, vitamin B6)
Safety & Cautions
⚠
Never eat or chew the seeds, and avoid leaf, bark and root preparations: they are concentrated in neurotoxic annonaceous acetogenins (annonacin, squamocin), and crushed seeds/seed oil are irritant and toxic to the eyes (documented cases of severe keratoconjunctivitis from accidental ocular exposure). Regular or heavy intake of the fruit, juice or Annonaceae herbal teas is epidemiologically associated with atypical parkinsonism and cognitive decline, so limit frequency, especially in older adults or those with movement/neurodegenerative disorders. Leaf extracts lower blood glucose in animals, so there is a theoretical additive effect with antidiabetic drugs (hypoglycemia) — monitor if using such preparations. The pulp is high in natural sugars; portion accordingly in diabetes. Pregnancy/lactation: insufficient safety data for medicinal extracts — avoid. Educational only — always check with your doctor or pharmacist before combining Sugar Apple (Custard Apple) with any medicine.
Common questions about Sugar Apple (Custard Apple)
What is Sugar Apple (Custard Apple) used for?
Sugar Apple (Custard Apple) is most often taken for Good source of vitamin C and dietary fiber (whole-food nutrition), Antioxidant capacity from polyphenols and ascorbate (mostly in vitro), Antidiabetic / blood-glucose-lowering effect of leaf extracts (animal models only), Lipid-profile improvement (lower cholesterol/triglycerides in diabetic rodents). Sweet tropical fruit with a neurotoxin caveat
Does Sugar Apple (Custard Apple) work — what does the evidence say?
Preliminary evidence. Early or small human trials; promising but not yet conclusive. Sugar apple is a nutritious tropical fruit, supplying meaningful vitamin C, fiber, vitamin B6 and potassium per serving, so its core value is as whole-food nutrition. The popular medicinal claims — antidiabetic, antioxidant, lipid-lowering, antihypertensive and anticancer effects — rest almost entirely on in vitro work and rodent studies of leaf, bark or seed extracts, not the edible pulp, and there are essentially no rigorous human randomized trials of the fruit. Repeated animal studies do show that aqueous and ethanolic leaf extracts lower fasting glucose and improve lipid profiles in diabetic rats and rabbits, which is consistent across labs but not validated in people. The most important human-relevant signal is a safety concern rather than a benefit: the genus Annona is rich in annonaceous acetogenins (annonacin, squamocin), potent mitochondrial complex I inhibitors that are neurotoxic in cell and rodent models. Epidemiology and a 180-patient Caribbean cohort link consumption of Annonaceae fruit, juice and herbal tea to worse, often levodopa-unresponsive atypical parkinsonism and greater cognitive impairment, even at relatively low cumulative intake. Acetogenins are concentrated in the seeds, peel and leaves, with smaller amounts in pulp, so occasional whole-fruit eating is generally considered low risk while heavy or daily consumption — and especially seed/leaf preparations — is not. Overall the human evidence is preliminary: enjoy the fruit as food, but treat therapeutic and "superfood" claims as unproven.
What is the typical dose of Sugar Apple (Custard Apple)?
1 medium fruit (about 155 g edible pulp); the seeds, peel, leaves and roots should not be eaten.
Is Sugar Apple (Custard Apple) safe? Any cautions or side effects?
Never eat or chew the seeds, and avoid leaf, bark and root preparations: they are concentrated in neurotoxic annonaceous acetogenins (annonacin, squamocin), and crushed seeds/seed oil are irritant and toxic to the eyes (documented cases of severe keratoconjunctivitis from accidental ocular exposure). Regular or heavy intake of the fruit, juice or Annonaceae herbal teas is epidemiologically associated with atypical parkinsonism and cognitive decline, so limit frequency, especially in older adults or those with movement/neurodegenerative disorders. Leaf extracts lower blood glucose in animals, so there is a theoretical additive effect with antidiabetic drugs (hypoglycemia) — monitor if using such preparations. The pulp is high in natural sugars; portion accordingly in diabetes. Pregnancy/lactation: insufficient safety data for medicinal extracts — avoid.
How many studies support Sugar Apple (Custard Apple)?
NutriDex cites 11 sources for Sugar Apple (Custard Apple), graded "Preliminary".
Cite this page
APA
Peh, D. (2026). Sugar Apple (Custard Apple) (Annona squamosa): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 16 Sept 2026, from https://nutridex.info/s/sugar-apple
BibTeX
@misc{nutridex_sugar_apple,
author = {Peh, Daryl},
title = {Sugar Apple (Custard Apple) (Annona squamosa): Benefits, Dosage, Side Effects \& Evidence},
year = {2026},
howpublished = {NutriDex --- The Supplement Research Compendium},
url = {https://nutridex.info/s/sugar-apple},
note = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-09-16}
}
For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.