Syzygium cumini (Syzygium cumini): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Syzygium cumini work to lower blood sugar?

Syzygium cumini seeds contain jamboline and jambosine, compounds believed to support pancreatic beta-cell function and insulin secretion. These bioactive constituents may help slow the conversion of carbohydrates to glucose and improve cellular glucose uptake. Anthocyanins and ellagic acid provide additional antioxidant effects that may protect pancreatic tissue. Evidence level C indicates preliminary research supports these mechanisms, though more rigorous clinical trials are needed.

Can I take Syzygium cumini with diabetes medications like metformin?

Syzygium cumini may interact with conventional diabetes medications. Combining it with metformin, insulin, or other glucose-lowering drugs could cause additive hypoglycemic effects, potentially leading to dangerously low blood sugar levels. If you take prescription diabetes medications, consult your healthcare provider before adding Syzygium cumini. Close blood glucose monitoring is essential if combination use is medically supervised.

What is the recommended daily dosage of Syzygium cumini seed powder?

The typical adult dosage of Syzygium cumini seed powder is 500-1000mg daily, traditionally taken in divided doses. This Ayurvedic recommendation is based on historical use rather than standardized clinical trials. Start with the lower dose to assess individual tolerance and gastrointestinal response. Consult a qualified healthcare practitioner for personalized dosing, especially if you have existing health conditions or take other medications.

Is Syzygium cumini safe to take during pregnancy and breastfeeding?

Syzygium cumini is considered unsafe during pregnancy and should be avoided. The herb's effects on blood sugar regulation may pose risks to fetal development and pregnancy outcomes. There is insufficient safety data for breastfeeding women, so avoidance is recommended. Pregnant or nursing individuals should consult their healthcare provider before using any herbal supplements for blood sugar management.

What are the traditional uses of Syzygium cumini in Ayurvedic medicine?

Syzygium cumini, also known as jamun or Java plum, has been used extensively in Ayurvedic and folk medicine primarily for diabetes management and blood sugar control. Traditional applications include treating digestive conditions, managing diarrhea, and supporting overall digestive health. The seeds and bark are the most commonly used medicinal parts. Evidence level C indicates preliminary research supports some traditional uses, though clinical evidence remains limited.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Syzygium cumini, also known as Jamun or black plum, is a tropical evergreen medicinal plant from the Myrtaceae family used primarily for treating metabolic issues such as diabetes [PMID:36364010].

Background

Syzygium cumini is an evergreen tree distributed throughout the Indian subcontinent, Southeast Asia, and East Africa [PMID:23460190]. It is cultivated mainly in Asian countries including India, Pakistan, Sri Lanka, and Bangladesh [PMID:36364010].

Traditional uses

It has been used in Indian and other traditional medicines to treat a variety of diseases and physiological conditions [PMID:36364010]. Specifically, jamun leaves are used in Ayurvedic medicine to treat diabetes and gall bladder stones [PMID:37667613].

Active compounds

The plant contains flavonoids, polyphenols, antioxidants, iron, and vitamin C [PMID:36364010]. Specific compounds include anthocyanins (cyanidin, petunidin, malvidin, delphinidin) [PMID:36297820], ellagic acid, gallic acid, tannins, terpenes, and essential oils [PMID:40831544, PMID:37667613]. Seeds contain alkaloids, jambosine, and glycosides such as jambolin or antimellin [PMID:23569906]. Other identified compounds include syringetin [PMID:37373110] and phenolipids such as jambone E (JE) [PMID:40653024].

Mechanism of action

Jambolin or antimellin in the seeds is claimed to halt diastatic conversion [PMID:23569906]. The phenolipid jambone E (JE) attenuates obesity by modulating the NF-κB/NLRP3 signaling pathway and the gut microbiota-bile acid-FXR axis, while promoting insulin receptor β/protein kinase B-mediated insulin signaling in the liver, adipose tissue, and skeletal muscles [PMID:40653024].

Clinical evidence

Evidence CDiabetes

Different parts of the plant, especially fruits, seeds, and stem bark, show promising activity against diabetes [PMID:23642956].

Evidence DObesity and Hyperlipidemia

Supplementation of jambone E (JE) at 75 and 150 mg/kg for 10 weeks significantly attenuated body weight gain, adipocyte hypertrophy, and hyperlipidemia in high-fat diet-fed mice [PMID:40653024].

Evidence DHormonal Breast Cancer

In rats, a jamun-supplemented diet significantly delayed first tumor appearance, reduced tumor incidence (65% vs 96%), tumor burden, and tumor multiplicity compared to control [PMID:27030099].

Evidence DOvarian Cancer

Phytochemicals extracted from S. cumini fruits demonstrated anti-proliferative effects on the ovarian cancer cell line PA-1 [PMID:34916393].

Safety & adverse effects

In zebrafish (Danio rerio), hydroalcoholic extract of jambolan caused increased malformations and mortality at concentrations between 50 and 200 μg/ml, with lethal concentrations (LC50) estimated at 118.4 μg/ml for embryos and 68.86 μg/ml for adults [PMID:40200929].

Evidence summary

The evidence consists primarily of review articles and preclinical studies (in vitro and animal models). While there is strong traditional and experimental support for antidiabetic and antioxidant properties, high-level human clinical trial data is limited in the provided abstracts.

PubMed sources

1.PMID: 33922923 (2021) — Editorial for Special Issue: Anthocyanin. · Molecules (Basel, Switzerland)
2.PMID: 36364010 (2022) — Astounding Health Benefits of Jamun (Syzygium cumini) toward Metabolic Syndrome. · Molecules (Basel, Switzerland)
3.PMID: 40831544 (2025) — Therapeutic Potentials of Jamun (Syzygium cumini) and Its Integration Into Modern Food Technologies: A Review. · International journal of food science
4.PMID: 37667613 (2023) — Exploring the Chemical and Biological Potential of Jamun (Syzygium cumini (L.) Skeels) Leaves: A Comprehensive Review. · Chemistry & biodiversity
5.PMID: 23569906 (2012) — Syzygium cumini (L.) Skeels: a review of its phytochemical constituents and traditional uses. · Asian Pacific journal of tropical biomedicine

Syzygium cumini

Sources & Citations

Calculate a safe dose of Syzygium cumini

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Copalchi

Nopal

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources

Syzygium cumini

Sources & Citations

Calculate a safe dose of Syzygium cumini

Related Herbs

Teucrium polium

Copalchi

Nopal

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources