Herbs (Global Traditional) · Southeast Asian
Orthosiphon stamineus (Java Tea)
Moderate Evidencebotanical
Hermetica Superfood Encyclopedia
Java Tea (Orthosiphon stamineus) contains rosmarinic acid and flavonoids that inhibit α-glucosidase and α-amylase enzymes to regulate blood sugar. This traditional Jamu herb demonstrates diuretic effects and anti-adhesive activity supporting kidney and urinary tract health.
Orthosiphon stamineus, commonly known as Java Tea, is a perennial herb in the Lamiaceae family native to tropical Asia, including Southeast Asia, southern Africa, Madagascar, and northeastern Australia. The medicinal parts are primarily the dried leaves and twig tips, extracted using solvents like water, ethanol, methanol, or chloroform to concentrate bioactive compounds including flavonoids, phenolic acids, diterpenes, and essential oils.
The research dossier reveals a notable gap: no human clinical trials, RCTs, or meta-analyses are documented for Orthosiphon stamineus. All available evidence comes from preclinical studies, including antidiabetic effects in streptozotocin-induced diabetic rats, antihypertensive effects in animal models, and in vitro antiadhesive activity against uropathogenic bacteria (PMID: 34521130).
No clinically studied human dosage ranges are available. Preclinical studies used 1000 mg/kg in diabetic rats and 2 mg/mL extracts for glucose uptake assays. Traditional preparations typically involve leaf infusions with rosmarinic acid content measured at 243 ± 22 µg/mL. Consult a healthcare provider before starting any new supplement.
Orthosiphon stamineus (Java Tea) is consumed primarily as an herbal tea/extract rather than a whole food, so macronutrient content (protein, fat, carbohydrates) is negligible in typical use. Key bioactive compounds drive its nutritional and therapeutic profile: • Sinensetin (polymethoxylated flavone): 0.1–0.5% dry weight in leaves; primary bioactive; demonstrates antioxidant, anti-inflammatory, and diuretic activity; lipophilic nature limits aqueous bioavailability but enhanced in ethanol extracts • Eupatorin: co-occurring polymethoxylated flavone alongside sinensetin; concentrations approximately 0.05–0.2% dry weight; contributes to α-glucosidase inhibition • Rosmarinic acid (caffeic acid ester): 1–3% dry weight in leaves; water-soluble; one of the most abundant phenolic acids; antioxidant ORAC values significant; well-absorbed orally with documented plasma appearance • 3'-Hydroxy-5,6,7,4'-tetramethoxyflavone: minor polymethoxylated flavone, present at trace levels (<0.1% dry weight) • Caffeic acid derivatives: including cichoric acid and chlorogenic acid at approximately 0.1–0.5% combined • Betulinic acid (pentacyclic triterpene): present in leaf wax fractions; limited aqueous solubility; contributes to antiadhesive uropathogenic activity • Ursolic acid: approximately 0.05–0.1% dry weight; lipophilic triterpene with anti-inflammatory properties • Potassium: notably high in aqueous extracts (~500–800 mg per 100 g dry leaf); primary mineral contributing to diuretic osmotic effect; bioavailability high in water-soluble form • Calcium: approximately 200–400 mg per 100 g dry leaf • Magnesium: approximately 100–200 mg per 100 g dry leaf • Inositol derivatives: present at low concentrations; contribute to insulin-sensitizing preclinical activity • Total polyphenol content: 50–150 mg GAE per gram of dry extract depending on extraction method (ethanol > water for flavones; water > ethanol for rosmarinic acid) • Methylripariochromene A (MRC-A): a chromene compound identified specifically in this species; contributes to vasodilatory and antihypertensive effects at low concentrations Bioavailability notes: Polymethoxylated flavones (sinensetin, eupatorin) show poor water solubility, meaning standard hot-water tea preparations deliver substantially lower flavone concentrations than ethanolic extracts used in studies. Rosmarinic acid demonstrates good oral bioavailability (~30–60% absorbed). Potassium and mineral content is well-extracted in aqueous preparations. Standardized commercial extracts are typically normalized to sinensetin or rosmarinic acid content.
Java Tea's rosmarinic acid and sinensetin inhibit α-glucosidase and α-amylase enzymes, reducing carbohydrate digestion and glucose absorption. The herb's potassium content and flavonoids promote diuresis by increasing renal sodium excretion. Eupholin and other compounds exhibit anti-adhesive properties against bacterial adherence to urinary tract epithelium.
Animal studies demonstrate significant glucose reduction in diabetic rats at 1000 mg/kg doses, with α-glucosidase inhibition reaching 70% in vitro. Traditional diuretic effects are supported by preclinical studies showing increased urine output and electrolyte excretion. Limited human clinical data exists, with most evidence from traditional use patterns and laboratory studies. Current research lacks large-scale randomized controlled trials in human populations.
Java Tea is generally well-tolerated with mild diuretic effects as the primary side effect. Potential interactions with diabetes medications may cause hypoglycemia due to additive glucose-lowering effects. Concurrent use with diuretics or blood pressure medications requires monitoring for excessive fluid loss or hypotension. Safety during pregnancy and lactation is not established, requiring medical supervision.
