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

Frequently asked questions

How does Syzygium jambos lower blood sugar?

Syzygium jambos contains jambosine, an alkaloid that may inhibit enzymes involved in carbohydrate metabolism, potentially slowing glucose absorption in the digestive tract. The plant's quercetin and other flavonoids provide antioxidant activity that may help protect pancreatic beta cells from oxidative damage. Tannins contribute astringent properties beneficial for gastrointestinal conditions. Evidence level C indicates these mechanisms are primarily supported by in vitro and animal studies, with limited human clinical data available to confirm effects.

Can Syzygium jambos interact with diabetes medications?

Yes, Syzygium jambos may interact with antidiabetic medications. Because the herb has blood sugar-lowering properties, combining it with prescription medications like metformin, insulin, or sulfonylureas could cause additive effects, potentially leading to hypoglycemia (dangerously low blood sugar). Patients taking diabetes medications should consult a healthcare provider before using this herb. Regular blood glucose monitoring is essential if concurrent use is approved. Evidence level C supports this cautionary approach based on pharmacological reasoning and traditional use data.

What is the recommended dosage for Syzygium jambos?

Traditional use suggests 2-3 grams of dried bark or leaf prepared as a tea, taken once or twice daily. Preparation typically involves steeping the dried material in hot water for 10-15 minutes before straining. This dosage is based on ethnobotanical practice rather than standardized clinical trials. Due to limited clinical evidence (level C), individuals should start with lower doses to assess tolerance and consult a qualified healthcare practitioner for personalized guidance, especially those with existing health conditions.

Is Syzygium jambos safe during pregnancy and breastfeeding?

Syzygium jambos is considered unsafe during pregnancy and breastfeeding. The plant contains compounds that may stimulate uterine contractions or affect fetal development, though specific human studies are limited. Traditional use has historically excluded pregnant women, and no clinical safety data exists for this population. Women who are pregnant, planning pregnancy, or breastfeeding should avoid this herb entirely. Evidence level C indicates this recommendation is based on traditional knowledge and theoretical concerns rather than direct clinical evidence.

What are the side effects of Syzygium jambos?

Syzygium jambos may cause mild gastrointestinal changes, including nausea, bloating, or loose stools, particularly when taken at higher doses or on an empty stomach. These effects are typically mild and resolve after discontinuation. The tannin content may cause constipation in some individuals with prolonged use. No serious adverse events have been documented in traditional use literature. Evidence level C indicates safety data is limited to traditional use reports and preliminary research. Discontinue use if persistent or severe symptoms occur and consult a healthcare provider.

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 jambos, commonly known as rose apple, is a medicinal plant used traditionally for various health concerns, particularly inflammatory and stress-related diseases [PMID:35177986].

Background

Syzygium jambos (L.) Alston, also known as rose apple, is a member of the Myrtaceae family native to South and Southeast Asia [PMID:30764239, PMID:33458204]. It is an autotetraploid species (2n = 4x = 44) [PMID:37868305].

Traditional uses

It has a long history as a traditional medicine with a broad spectrum of applications across various cultures, including use in sub-Saharan Africa to treat several diseases [PMID:35177986, PMID:17478066] and in Bangladesh for the treatment of inflammatory diseases [PMID:27021114].

Active compounds

The plant contains a diverse group of secondary metabolites, including phenolic acids, gallic acid derivatives, flavonoids, ellagitannins [PMID:38250734], and triterpenes such as friedelin, beta-amyrin acetate, betulinic acid, and lupeol [PMID:17128435]. Fruit extracts contain alkylphenols (cardanols and alkylresorcinols) [PMID:35849981], phloroglucinol derivatives [PMID:26554667], and polyphenols [PMID:40690507].

Mechanism of action

Cardanols from the fruit may suppress lipid accumulation and reduce triglyceride content via activation of AMPK/PPARα signaling pathways [PMID:35849981]. Certain fruit compounds act as inhibitors of α-glucosidase [PMID:38006459]. Bark extracts in diabetic rat models modulated the hepatic IRS-2/AKT/GLUT4 signaling pathway [PMID:34463263].

Clinical evidence

Evidence DDiabetes/Hyperglycemia

Bark extract mitigated elevated blood glucose, fructosamine, and pancreatic oxidative stress in streptozotocin-induced diabetic rats [PMID:34463263].

Evidence DPain/Nociception

Leaf hydro-alcoholic extracts produced a dose-dependent increase in withdrawal response latencies in rat hot plate tests and reduced pain scores in formalin tests [PMID:17478066].

Evidence DDyslipidemia

Cardanols from S. jambos fruit suppressed lipid accumulation and reduced triglyceride content in oleic acid-overloaded HepG2 cells [PMID:35849981].

Evidence DHepatotoxicity

Methanolic leaf extract showed dose-dependent hepatoprotective activity against paracetamol-induced damage in Wistar albino rats [PMID:24501529].

Evidence DInflammation

Ethanol extract demonstrated anti-inflammatory effects in rat models of carrageenan and histamine-induced paw edema [PMID:27021114].

Safety & adverse effects

Methanol leaf extract demonstrated toxicity in the Artemia franciscana bioassay with a 48-h LC(50) of 387.9 ± 38.8 μg/mL [PMID:21808530].

Evidence summary

The evidence consists primarily of in vitro studies and animal models (Level D), with limited clinical trial data mentioned in abstracts. Most findings suggest potential antidiabetic, anti-inflammatory, and hepatoprotective properties.

PubMed sources

1.PMID: 35177986 (2022) — Syzygium jambos L. Alston: An Insight Into its Phytochemistry, Traditional Uses, and Pharmacological Properties. · Frontiers in pharmacology
2.PMID: 33458204 (2020) — Complete chloroplast genome sequence of the rose apple, Syzygium jambos (Myrtaceae). · Mitochondrial DNA. Part B, Resources
3.PMID: 35392889 (2022) — Inhibitory effects of Syzygium jambos extract on biomarkers of endothelial cell activation. · BMC complementary medicine and therapies
4.PMID: 30764239 (2009) — A Recurrent Epiphytotic of Guava Rust on Rose Apple, Syzygium jambos, in Hawaii. · Plant disease
5.PMID: 35849981 (2022) — Discovery, preparation and characterization of lipid-lowering alkylphenol derivatives from Syzygium jambos fruit. · Food chemistry

Syzygium jambos

Sources & Citations

Calculate a safe dose of Syzygium jambos

Physalis peruviana

Pterocarpus santalinus

Caesalpinia bonduc

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources

Syzygium jambos

Sources & Citations

Calculate a safe dose of Syzygium jambos

Related Herbs

Physalis peruviana

Pterocarpus santalinus

Caesalpinia bonduc

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources