# Star Leaf **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/star-leaf **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-15 **Evidence Score:** 4 / 10 **Category:** Fruit **Also Known As:** Averrhoa carambola, Star fruit leaf, Carambola leaf, Belimbing leaf, Yang tao leaf ## Overview Star Leaf (Averrhoa carambola leaf) contains flavonoids, terpenes, and glycoside compounds that demonstrate anticancer activity with IC₅₀ values of 20.89 μg/mL against triple-negative breast cancer cells. The ethanolic leaf extract inhibits cancer cell proliferation, migration, and adhesion through bioactive metabolites that disrupt cellular immortality pathways. ## Health Benefits - **Promotes [liver detox](/ingredients/condition/detox)ification**: and metabolic health by activating liver enzymes and supporting detox pathways with oxalic acid and polyphenols. - **Enhances [digestive health](/ingredients/condition/gut-health)**: and gut microbiome balance through soluble fiber and organic acids. - **Provides potent antioxidant**: and [anti-inflammatory](/ingredients/condition/inflammation) protection with quercetin and flavonoids, neutralizing [free radical](/ingredients/condition/antioxidant)s. - **Strengthens [immune function](/ingredients/condition/immune-support)**: and supports respiratory health with vitamin C and antimicrobial compounds. - **Supports hydration and**: electrolyte balance with potassium, magnesium, and other essential minerals. ## Mechanism of Action Star Leaf's ethanolic extract contains flavonoids, terpenes, and glycoside compounds that inhibit cancer cell viability by disrupting proliferation and immortality pathways. The bioactive compounds, including quercetin and oxalic acid, activate [liver detox](/ingredients/condition/detox)ification enzymes while providing [antioxidant protection](/ingredients/condition/antioxidant) through free radical neutralization. Additional compounds like 7α-hydroxy-dihydro-epideoxyarteannuin B demonstrate potent antitumor activity against K562 and HeLa cell lines. ## Clinical Summary Preclinical studies show Star Leaf extract achieves 97.4% reduction in clonogenic survival at 15 μg/mL concentration in triple-negative breast cancer cells. Mouse models demonstrate reduced hepatocellular carcinoma incidence and tumor burden with leaf/root extract treatment. Related star fruit juice studies in Thai elderly showed significant HDL-C increases (p=0.03) and LDL-C decreases (p=0.02) after 4 weeks of consumption. Evidence remains primarily preclinical with no human clinical trials specifically testing leaf extracts. ## Nutritional Profile - Dietary Fiber (soluble fiber) - Vitamin C - Potassium, Magnesium, Calcium - Quercetin - Flavonoids - Oxalic Acid - Organic Acids ## Dosage & Preparation - Commonly consumed as a leafy vegetable in traditional cuisines. - Modern applications include powdered extracts for supplements. - Recommended dosage for extract is 500–1,500 mg daily for liver, digestive, and [immune support](/ingredients/condition/immune-support). - Up to 2,500 mg daily may be used for enhanced [antioxidant](/ingredients/condition/antioxidant), metabolic, and hydration benefits. ## Safety & Drug Interactions Star Leaf contains high oxalic acid content that poses nephrotoxicity risks, particularly in patients with existing kidney impairment or renal disease. No specific drug interactions have been documented in available studies, though this may reflect limited clinical research rather than confirmed safety. Preclinical studies report no adverse events, but human safety data is lacking for concentrated leaf extracts. Patients with kidney disease should avoid Star Leaf preparations due to oxalate accumulation risk and potential kidney failure. ## Scientific Research Preliminary pharmacological studies suggest Star Leaf's potential for [liver detox](/ingredients/condition/detox)ification, digestive enhancement, and [antioxidant protection](/ingredients/condition/antioxidant), aligning with its traditional uses. Research indicates the presence of bioactive compounds like quercetin and oxalic acid, which contribute to its observed health benefits. ## Historical & Cultural Context Star Leaf has been historically revered in Ayurvedic, Traditional Chinese, Southeast Asian, and Pacific Island herbal systems. It was traditionally used for liver cleansing, digestive support, hydration, fever reduction, and to enhance immune resilience, reflecting its long-standing role in traditional medicine. ## Synergistic Combinations Role: Polyphenol/[antioxidant](/ingredients/condition/antioxidant) base Intention: Detox & Liver | Gut & [Microbiome](/ingredients/condition/gut-health) Primary Pairings: - Ginger (Zingiber officinale) - Camu Camu - Coconut Water Powder ## Frequently Asked Questions ### What is the effective dosage of Star Leaf extract for cancer treatment? Preclinical studies show IC₅₀ values of 20.89 μg/mL for triple-negative breast cancer cells, with 15 μg/mL achieving 97.4% reduction in clonogenic survival. However, no human clinical trials have established safe or effective dosages for cancer treatment. ### Can Star Leaf help with cholesterol management? Related star fruit studies show potential lipid benefits, with juice consumption increasing HDL cholesterol and decreasing LDL cholesterol significantly in elderly populations. The fruit enhances fecal excretion of cholesterol by 123-126% and bile acids by 129-133%, though specific leaf effects require further research. ### Is Star Leaf safe for people with kidney problems? Star Leaf contains high oxalic acid content that poses serious nephrotoxicity risks, especially for individuals with existing kidney impairment. The oxalate accumulation can lead to kidney failure, making it contraindicated for patients with renal disease. ### What compounds make Star Leaf effective for liver detoxification? Star Leaf contains quercetin, polyphenols, and oxalic acid that activate liver detoxification enzymes and support detox pathways. The ethanolic extract also provides flavonoids, terpenes, and glycoside compounds identified through ¹H NMR analysis that contribute to hepatoprotective effects. ### How does Star Leaf compare to Sauropus androgynus? Star Leaf refers specifically to Averrhoa carambola leaves with documented anticancer and lipid-modulating properties, while Sauropus androgynus is a different Southeast Asian leafy vegetable. Both contain beneficial compounds, but they represent distinct species with different bioactive profiles and traditional uses. ### What is the most bioavailable form of Star Leaf for maximum absorption? Star Leaf extract in standardized form (containing 30-50% polyphenols and quercetin) demonstrates superior bioavailability compared to whole leaf powder, as the extraction process concentrates active compounds and reduces oxalic acid content that may inhibit absorption. Liquid extracts or capsules with enhanced absorption technology show faster gastric transit and better intestinal uptake than raw dried leaf preparations. Taking Star Leaf extract with healthy fats or vitamin C sources can further enhance the bioavailability of its flavonoid compounds. ### Does Star Leaf interact with blood pressure or diabetes medications? Star Leaf contains polyphenols and compounds that may have mild blood sugar-modulating effects, warranting caution if combined with diabetes medications as it could theoretically potentiate glucose-lowering effects. While no direct interactions with common antihypertensive drugs are documented, the herb's mild diuretic properties from organic acids suggest monitoring blood pressure medication efficacy when supplementing. Individuals taking metformin, insulin, or antihypertensive agents should consult a healthcare provider before adding Star Leaf supplementation. ### Who should avoid Star Leaf supplementation, and are there specific at-risk populations? Individuals with a history of kidney stones or hyperoxaluria should avoid concentrated Star Leaf supplements due to their oxalic acid content, which can contribute to stone formation in susceptible individuals. Pregnant and breastfeeding women should exercise caution as safety data is limited, and those taking anticoagulants should consult their doctor since high-dose polyphenols may have mild antiplatelet properties. People with diagnosed oxalate-sensitive conditions or those on restricted-oxalate diets for medical reasons should avoid Star Leaf supplementation. ## References Sources: https://pubmed.ncbi.nlm.nih.gov/31254189; https://doi.org/10.1016/j.jep.2021.113786; https://www.sciencedirect.com/science/article/abs/pii/S0963996920318745; https://www.frontiersin.org/articles/10.3389/fphar.2021.735112/full; https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7519845/ https://en.wikipedia.org/wiki/Grevillea_asteriscosa; https://florabase.dpaw.wa.gov.au/browse/profile/2074 --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*