Jambolan

Botanical

What is it

Jambolan (Syzygium cumini, formerly Eugenia jambolana), also called java plum or jamun, is a tropical fruit and tree native to South Asia. Its fruit, seeds, and bark have been used in Ayurveda for blood sugar support and digestion.

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Blood sugar support

Limited Evidence

Small Indian trials suggest seed extract may modestly reduce fasting and postprandial glucose. Evidence is preliminary; larger high-quality trials needed.

Diarrhea (traditional use)

Mixed Evidence

Astringent tannins in bark and fruit are traditionally used for diarrhea; modern clinical evidence is limited.

How it works

Jambolan seed and fruit contain anthocyanins, tannins, jamboline glycosides, and ellagic acid. Animal and small human studies suggest the seed extract may help lower blood glucose by slowing carbohydrate digestion (alpha-amylase and alpha-glucosidase inhibition) and may modestly improve insulin sensitivity. The fruit also has astringent tannins traditionally used for diarrhea, and antioxidant polyphenols that contribute to its dark color. Most published clinical trials are small, varied in design, and conducted in India. Evidence is preliminary and mixed. Larger trials with standardized extracts are needed before jambolan can be recommended as a reliable adjunct to diabetes care.

Dosage

Traditional Ayurvedic doses: 5 to 15 g/day of seed powder, or 100 to 500 mg/day of standardized seed extract. Doses used in clinical trials vary widely.

When and how to take it

Take jambolan extract 30 minutes before carbohydrate-containing meals for the most relevant blood sugar effect. Split doses across the day if using larger amounts. Consistency matters more than precise timing.

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Jambolan seed powder

Used at 5 to 15 g/day, often mixed in water or buttermilk.

Traditional Ayurvedic form; bitter, astringent taste.

Standardized jambolan seed extract

Used in modern formulations at 100 to 500 mg/day.

Concentrated active compounds; smaller dose.

Safety

Generally well tolerated as food. Seed extracts may cause mild hypoglycemia, especially if combined with diabetes medications. Long-term safety data are limited.

Who should be cautious

Pregnant and breastfeeding women should avoid medicinal doses. People with diabetes using jambolan extracts should monitor blood sugar carefully. Discontinue 2 weeks before surgery due to potential hypoglycemic effects.

Interactions

May potentiate the glucose-lowering effects of insulin and oral antidiabetic medications. Monitor blood glucose closely if combining.

Food sources

Jambolan/jamun fruit (fresh)

Amount
100 g
%DV
—

Jambolan juice or syrup

Amount
1 cup
%DV
—

Frequently asked questions

Can jambolan replace my diabetes medication?⌄

No. Jambolan has only preliminary evidence and is not a substitute for prescription diabetes care. Talk to your clinician before adding it if you take diabetes medications.

Is jambolan the same as jamun?⌄

Yes, jamun is the common Hindi name for the same fruit (Syzygium cumini).

References

Jambolan on Wikidata — Wikidata link

Jambolan on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Jambolan (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.