Jamun

Syzygium cumini · Java plum · Eugenia jambolana

Snapshot

Indications	Contraindications
Type 2 diabetes^{1, 2} Exercise oxidative stress³ Muscle damage markers³	Pregnancy or lactation⁴ Intrinsic clotting factor deficiency⁵

Jamun (Syzygium cumini), also called Java plum, is a tropical fruit tree whose fruit, seed, and leaf are used in Ayurvedic practice, where the leaf and seed have long been used for diabetes. Its tannin and flavonoid content gives it antioxidant and glucose-handling activity, the basis for both uses below. People take it for blood glucose support in type 2 diabetes and for antioxidant support around exercise.

Human research is limited to about seven small trials, mostly in type 2 diabetes, with others in athletes and leg ulcers. In 2025 laboratory work, leaf essential oil inhibited growth of two breast cancer cell lines; no human trial has tested it. Eight products list jamun, sold as seed powder, capsule, and tablet, often within combination Ayurvedic formulas; see Form comparison.

Per one product label, patients on diabetes medications monitor blood glucose before use to avoid hypoglycemia⁴.

Last updated October 16, 2026. Read how we make monographs.

In the full monograph

28 sources, 25 studies

When to useThe situations practitioners use it for, each with the reason and the study behind it.
SafetyWho should avoid it, who needs extra care, and the side effects reported in studies.
InteractionsThe medicines and supplements it interacts with, the effect of each, and what labeling says to watch.
Protocol notesThe doses used in studies, how and when they were taken, and how the forms on the market compare.
How it worksWhat it is and how it works in the body, in plain terms.
Published studiesThe studies behind each use, popular claims checked against them, and trials still under way.
Word of mouthWhat patients and practitioners report online, kept separate from the clinical evidence.
Clinical perspectiveA closing read of where the evidence is solid, where it is thin, and what has not been studied.

Snapshot

In the full monograph

Sources