# Sinensetin **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/sinensetin **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-19 **Evidence Score:** 4 / 10 **Category:** Compound **Also Known As:** 5,6,7,3',4'-pentamethoxyflavone, PMF, Orthosiphon flavone, Java tea flavone, Cat's whiskers compound, Misai kucing bioactive, Kumis kucing extract compound ## Overview Sinensetin is a polymethoxylated flavonoid found in citrus peels that demonstrates potential as a chemotherapy adjuvant by inhibiting drug efflux pumps. This compound specifically targets P-glycoprotein and ABCG2 transporters, which may enhance cancer drug accumulation in resistant cells. ## Health Benefits • May enhance chemotherapy effectiveness by inhibiting P-glycoprotein drug efflux pumps (IC50 = 3.9 µM in vitro studies only) • Potential to increase cancer drug accumulation by inhibiting ABCG2 transporter (181.7% mitoxantrone increase at 10 µM in cell studies) • Demonstrates [antimicrobial](/ingredients/condition/immune-support) activity against E. coli O157:H7 motility (100 µM in vitro) • May improve drug bioavailability through transport protein inhibition (79.68% P-gp inhibition at 100 µM in cell models) • Note: All benefits based solely on preliminary cell culture studies; no human clinical evidence exists ## Mechanism of Action Sinensetin inhibits P-glycoprotein drug efflux pumps with an IC50 of 3.9 µM, preventing cancer cells from expelling chemotherapy drugs. The compound also blocks ABCG2 transporter activity, increasing mitoxantrone accumulation by 181.7% at 10 µM concentrations. These mechanisms may help overcome multidrug resistance in cancer treatment by keeping therapeutic compounds inside target cells longer. ## Clinical Summary Current evidence for sinensetin comes exclusively from in vitro cell culture studies examining its effects on drug transporter proteins. Laboratory research shows significant inhibition of P-glycoprotein (IC50 = 3.9 µM) and enhanced chemotherapy drug retention in resistant cell lines. Studies also demonstrate [antimicrobial](/ingredients/condition/immune-support) properties against various bacterial strains in controlled laboratory conditions. No human clinical trials or animal studies have been published to validate these cellular findings or establish safety profiles. ## Nutritional Profile Sinensetin is a polymethoxylated flavone (PMF) bioactive compound, not a macronutrient or conventional nutrient source. It contains no meaningful protein, fat, carbohydrate, fiber, vitamin, or mineral content in isolation. Molecular formula: C20H20O7; molecular weight: 376.37 g/mol. Structurally characterized by five methoxy groups at positions 4', 5, 6, 7, and 3' on the flavone backbone, distinguishing it from non-methylated flavones. Found primarily in citrus peel extracts (notably Citrus sinensis, Orthosiphon stamineus), with concentrations in dried Orthosiphon stamineus leaves reported at approximately 0.1–1.5 mg/g dry weight depending on extraction method and plant origin. Bioavailability is notably limited due to poor aqueous solubility (log P approximately 3.5, indicating high lipophilicity), which restricts oral absorption under standard conditions; however, its PMF structure confers greater [intestinal permeability](/ingredients/condition/gut-health) compared to non-methylated flavonoids. Existing data indicates it may improve its own and co-administered drug bioavailability through inhibition of ABCG2 transporter (181.7% mitoxantrone accumulation increase at 10 µM in cell studies) and P-glycoprotein efflux pumps (IC50 = 3.9 µM, in vitro). No established dietary reference intake or recommended daily amount exists. All quantified effects are derived from in vitro cell studies; human pharmacokinetic data remain limited. ## Dosage & Preparation No clinically studied dosage ranges exist as no human trials have been conducted. In vitro studies used concentrations of 5-100 µM for anticancer and [antimicrobial](/ingredients/condition/immune-support) effects, but these cannot be translated to human dosing. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions Safety data for sinensetin supplementation in humans is currently unavailable due to lack of clinical studies. Theoretical drug interactions may occur with chemotherapy medications, potentially altering their pharmacokinetics and toxicity profiles unpredictably. The compound's ability to inhibit drug efflux pumps could increase both therapeutic effects and adverse reactions of co-administered medications. Pregnant and breastfeeding women should avoid sinensetin supplements due to unknown safety implications and potential interference with fetal development. ## Scientific Research No human clinical trials, randomized controlled trials, or meta-analyses have been conducted on sinensetin. All available evidence is limited to in vitro cell culture studies focusing primarily on its ability to inhibit drug efflux pumps P-glycoprotein and ABCG2 in cancer cell models. ## Historical & Cultural Context No information on traditional medicinal uses or historical context is documented in the available research. The compound's natural occurrence in Java tea suggests potential traditional use, but specific historical applications are not detailed. ## Synergistic Combinations Other flavonoids, P-glycoprotein inhibitors, ABCG2 inhibitors, Java tea compounds, pentamethoxyflavones ## Frequently Asked Questions ### What foods contain sinensetin naturally? Sinensetin is found primarily in citrus fruit peels, particularly orange and tangerine rinds. The compound is concentrated in the outer peel layers and is typically extracted for research purposes rather than consumed through whole foods. ### How does sinensetin help with cancer drug resistance? Sinensetin blocks P-glycoprotein and ABCG2 transporters that pump chemotherapy drugs out of cancer cells. By inhibiting these efflux pumps with an IC50 of 3.9 µM, it may help keep cancer medications inside resistant cells longer. ### Is sinensetin safe to take with chemotherapy? No safety data exists for combining sinensetin with chemotherapy drugs in humans. Since it affects drug transporters, it could unpredictably alter chemotherapy pharmacokinetics and should only be considered under oncologist supervision. ### What is the effective dose of sinensetin? No human dosing guidelines exist for sinensetin supplements. Laboratory studies show activity at 3.9-10 µM concentrations in cell cultures, but translating these levels to oral human doses requires clinical research. ### Does sinensetin have antimicrobial effects? Laboratory studies demonstrate that sinensetin exhibits antimicrobial activity against various bacterial strains in controlled conditions. However, no clinical trials have tested its effectiveness as an antimicrobial agent in humans or established minimum inhibitory concentrations. ### Does sinensetin interact with common cancer medications like tamoxifen or imatinib? Sinensetin may interact with cancer drugs metabolized by P-glycoprotein and ABCG2 transporters, potentially increasing their blood levels and toxicity risk. In vitro studies show sinensetin inhibits these efflux pumps at concentrations of 3.9–10 µM, but human clinical data on drug interactions remain limited. Anyone taking chemotherapy should consult their oncologist before adding sinensetin supplements, as it could unexpectedly amplify drug exposure. ### What does current clinical research show about sinensetin's effectiveness in humans? Most evidence for sinensetin comes from laboratory and cell culture studies rather than human clinical trials. While in vitro research demonstrates promising effects on cancer drug resistance and antimicrobial activity, these results have not been confirmed in controlled human studies. Before sinensetin is recommended as a clinical supplement, larger-scale human trials are needed to establish safety, efficacy, and optimal dosing in real-world use. ### Who should avoid sinensetin supplements, and are there specific populations at higher risk? Patients undergoing active chemotherapy should avoid sinensetin without medical supervision, as it may alter drug metabolism and treatment outcomes. Individuals with liver disease or those taking multiple medications metabolized by cytochrome P450 enzymes may face increased interaction risks. Pregnant women and children lack sufficient safety data and should avoid supplemental sinensetin until more clinical evidence becomes available. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*