Jambu

<h3> Absolute Contraindications of Jambu (Syzygium cumini) </h3> <h4>Concurrent use with antidiabetic drugs / insulin (risk of severe low blood sugar)</h4> <ul> <li> 🔴 <li> Recommendation: If you are already on insulin or strong oral diabetes medicines, do not take jambu extracts or concentrated seed/bark powders without a clinician’s supervision - your dose may need to be reduced. <li> Reasoning: Animal and experimental studies show jambu parts (bark, seed, leaf) lower blood glucose and improve glucose tolerance; combining them with prescribed hypoglycemic drugs can produce additive glucose lowering and symptomatic hypoglycaemia. <li> Scientific_Study_Title: Pharmacognostical standardization and antidiabetic activity of Syzygium cumini (Linn.) barks (Myrtaceae) on streptozotocin-induced diabetic rats <li> Scientific_Study_Authors: Akhilesh K Tripathi, Seema Kohli <li> Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/24760764/ <li> Scientific_Study_Excerpt: <p>In this controlled animal study, researchers gave Syzygium cumini bark extracts orally to streptozotocin-induced diabetic rats and observed a significant suppression of postprandial blood glucose in oral glucose tolerance tests and a reduction in fasting blood glucose over 21 days compared with diabetic controls. The extract’s activity was comparable though somewhat less than glibenclamide. Phytochemical screening identified flavonoids, tannins and glycosides that likely contribute to the hypoglycaemic effect. The data indicate a clear glucose-lowering action in vivo, supporting caution when combining jambu preparations with antidiabetic medication.</p> </ul> <h4>Pregnancy - especially high-dose or concentrated extracts [In layman terms: pregnancy]</h4> <ul> <li> 🤰 <li> Recommendation: Avoid concentrated jambu seed/extract supplements during pregnancy. If you consume the fresh fruit, keep intake moderate and discuss with your prenatal provider. <li> Reasoning: Animal teratogenic/gestational studies with concentrated extracts at moderate-to-high doses have produced effects on fetal growth and some developmental parameters; safety in human pregnancy is not established. <li> Scientific_Study_Title: Teratogenic Test of Jamblang Fruit Extract (Syzygium cumini) on the Fetus Mice (Mus musculus) <li> Scientific_Study_Authors: Cut Nur Kemala Dewi, Ayu Nirmala Sari, Raudhah Hayatillah <li> Scientific_Study_Link: https://jurnal.untirta.ac.id/index.php/biodidaktika/article/view/29255 <li> Scientific_Study_Excerpt: <p>This experimental teratogenicity study in pregnant mice administered 70% ethanol jamblang (Syzygium cumini) fruit extract during organogenesis and tracked maternal and fetal outcomes. At higher extract doses (200-300 mg/kg), treated groups showed reductions in fetal length and number of fetuses and increased occurrences of fetal hemorrhage and morphological abnormalities (e.g., open eyelids) compared with controls. The findings indicate dose-dependent developmental effects in this animal model, suggesting concentrated preparations may be unsafe in pregnancy without human safety data.</p> </ul> <h4>Active bleeding disorders or use of therapeutic anticoagulation/antiplatelet therapy [In layman terms: bleeding risk]</h4> <ul> <li> 🩸 <li> Recommendation: If you have a bleeding disorder or take anticoagulant or antiplatelet medicines (warfarin, DOACs, heparin, clopidogrel, aspirin), avoid jambu supplements or discuss with your physician before use. <li> Reasoning: In vivo and ex vivo studies show jambu leaf extracts prolong clotting times, increase anticoagulant markers and reduce platelet aggregation - changes that can increase bleeding tendency when combined with blood-thinning drugs. <li> Scientific_Study_Title: In vivo assessment of anticoagulant and antiplatelet effects of Syzygium cumini leaves extract in rabbits <li> Scientific_Study_Authors: (authors listed on PubMed entry) <li> Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/31481052/ <li> Scientific_Study_Excerpt: <p>Rabbits given Syzygium cumini leaf extract at experimental doses showed dose-dependent prolongation of bleeding and thrombin times, increased protein C and thrombin-antithrombin complex levels, and reduced platelet aggregation and fibrinogen at higher doses. Hematological and coagulation test changes were statistically significant versus control, indicating both anticoagulant and antiplatelet actions in vivo. These effects support concern about additive bleeding risk when jambu extracts are combined with conventional anticoagulants.</p> </ul> <h3> Relative Contraindications of Jambu (Syzygium cumini) </h3> <h4>People on antihypertensive medications or with labile low blood pressure</h4> <ul> <li> ⚠️ <li> Recommendation: Use caution and monitor blood pressure closely; consult your clinician before adding jambu supplements as doses may need adjustment. <li> Reasoning: Animal studies show jambu leaf extracts lower arterial blood pressure and relax vascular tissue; combining them with blood-pressure drugs may produce excessive lowering of blood pressure (symptoms: dizziness, fainting). <li> Scientific_Study_Title: Antihypertensive Effect of Syzygium cumini in Spontaneously Hypertensive Rats <li> Scientific_Study_Authors: (authors listed on PubMed entry) <li> Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/25614751/ <li> Scientific_Study_Excerpt: <p>In hypertensive rat models, oral administration of hydroalcoholic Syzygium cumini leaf extract produced time-dependent decreases in mean arterial pressure and reduced vascular contractility in isolated arterial rings. The extract’s vasorelaxant and hypotensive effects were dose-dependent and partially mediated by cholinergic pathways. These physiological changes suggest potential additive hypotensive effects if combined with antihypertensive medications in humans; caution and monitoring are advised.</p> </ul> <h4>Elective surgery or invasive procedures (due to bleeding risk)</h4> <ul> <li> ✂️ <li> Recommendation: Stop jambu supplements (especially concentrated extracts) at least 7-14 days before planned surgery unless advised otherwise by your surgeon/physician. <li> Reasoning: Studies show jambu extracts can prolong coagulation times and reduce platelet aggregation, which may increase perioperative bleeding risk. <li> Scientific_Study_Title: Phenolic contents-based assessment of therapeutic potential of Syzygium cumini leaves extract <li> Scientific_Study_Authors: (authors listed on PMC / PubMed entry) <li> Scientific_Study_Link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6715210/ <li> Scientific_Study_Excerpt: <p>Laboratory and animal data from this study show significant anticoagulant activity: prothrombin time and activated partial thromboplastin time were prolonged after treatment with S. cumini leaf extract versus control. The extracts also demonstrated anti-inflammatory and analgesic activity, but the coagulation changes support practical caution before surgery to avoid excess bleeding during and after operations.</p> </ul> <h4>Breastfeeding / lactation</h4> <ul> <li> 🍼 <li> Recommendation: There is insufficient human lactation safety data. Avoid concentrated jambu extracts while breastfeeding; small amounts of the fresh fruit in food are likely low risk but discuss with your healthcare provider. <li> Reasoning: Reliable clinical safety data for lactation are lacking; animal studies and traditional use provide incomplete evidence and do not establish safety for nursing infants. <li> Scientific_Study_Available: NA <li> Scientific_Study_Title: NA <li> Scientific_Study_Authors: NA <li> Scientific_Study_Link: NA <li> Scientific_Study_Excerpt: <p>NA</p> </ul>