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Limited evidenceHeart & metabolic

Jamun (Java Plum)

Syzygium cumini fruit and seed powder, one of the best known Ayurvedic remedies for diabetes. The antidiabetic evidence is almost entirely from rodents; no adequate randomized trial in people with type 2 diabetes appears in PubMed.

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What the science says

  • Blood glucose lowering Limited evidence

    A triterpenoid-enriched jamun fruit extract lowered glucose and lipids in streptozotocin-induced diabetic mice. Rodent diabetes models frequently show effects that do not reproduce in human trials.

  • Traditional antidiabetic use Limited evidence

    A systematic review of ethnomedicinal plants used for diabetes worldwide lists Syzygium cumini among the most frequently cited species. Frequency of traditional use documents popularity, not efficacy.

Dosage & safety

Studied doseTraditional use is 1–3 g of dried seed powder once or twice daily before meals; capsules are usually sold at 500 mg. No dose has been validated in a controlled human trial.
SafetyThe fruit is a common food and safe as such. Concentrated seed powder may lower blood glucose, so combining it with insulin or antidiabetic drugs risks hypoglycaemia, and it is often advised to stop it before surgery. Avoid in pregnancy. It should never replace prescribed diabetes treatment.

How to take it

TimingTraditionally taken before meals, once or twice daily.
With food?Before food with water; the powder is astringent and some people find it easier just after eating.
Worth knowingStop it roughly two weeks before any planned surgery, since it can interfere with blood-glucose control around the procedure.

Interactions

With medications

  • insulin, sulfonylureas and other diabetes medication

    Concentrated seed powder lowers blood glucose and adds to the drug effect. monitor glucose closely and talk to your doctor before combining

With other supplements

  • other glucose-lowering supplements such as fenugreek, berberine or bitter melon

    Additive blood-glucose lowering. do not stack several at once

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does jamun work for diabetes?

Jamun (Syzygium cumini) has limited evidence for diabetes: the glucose-lowering data come almost entirely from rodents, and no adequate randomized trial in people with type 2 diabetes appears in PubMed. Jamun should never replace prescribed diabetes treatment.

How much jamun seed powder should I take per day?

Traditional use of jamun is 1–3 g of dried seed powder once or twice daily before meals, and capsules are usually sold at 500 mg. No jamun dose has been validated in a controlled human trial.

Is jamun seed powder safe with diabetes medication?

Concentrated jamun seed powder may lower blood glucose and add to insulin or other diabetes medication, risking hypoglycaemia. Monitor your glucose closely and talk to your doctor before combining them.

Should I stop jamun before surgery?

Stop jamun seed powder roughly two weeks before planned surgery, since it can interfere with blood-glucose control around the procedure. Jamun supplements should also be avoided in pregnancy, although the fruit itself is a safe common food.

Scientific references

Related in Heart & metabolic

Herbal medicines: what the evidence says (335)