# Bilimbi (Averrhoa bilimbi)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/bilimbi-averrhoa-bilimbi
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-15
**Evidence Score:** 6 / 10
**Category:** Fruit
**Also Known As:** Averrhoa bilimbi, A. bilimbi, cucumber tree, tree sorrel

## Overview

Bilimbi (Averrhoa bilimbi) fruit is a rich source of phenolic compounds, flavonoids, and bioactive constituents such as 4H-pyran-4-one that exhibit potent antioxidant activity with DPPH [free radical scaveng](/ingredients/condition/antioxidant)ing IC50 values as low as 5.63 μg/mL, alongside demonstrated [antimicrobial](/ingredients/condition/immune-support), anti-obesity, and xanthine oxidase inhibitory properties (PMID 30297618; PMID 34132178). A 2024 study (PMID 39698098) further revealed that bilimbi phytocompounds induce thermogenic adipocyte differentiation in vitro, suggesting novel anti-obesity potential, while RP-HPLC-optimized flavonoid extracts from the fruit have confirmed significant antimicrobial activity against multiple pathogenic bacteria (PMID 34422535).

## Health Benefits

- **Reduces oxidative stress**: and protects against cellular damage due to potent [antioxidant activity](/ingredients/condition/antioxidant) from phenolic compounds.
- **Supports [cardiovascular health](/ingredients/condition/heart-health)**: by improving lipid profiles and potentially managing hypertension.
- **Enhances [immune function](/ingredients/condition/immune-support)**: and [collagen production](/ingredients/condition/skin-health) through its high vitamin C content.
- **Aids [digestion](/ingredients/condition/gut-health) and**: alleviates bloating by stimulating gastric juices with its acidic properties.
- **Demonstrates potential in**: supporting kidney health and preventing stone formation as a natural astringent and detoxifier.
- **Supports metabolic balance**: by stabilizing blood sugar levels and improving [insulin sensitivity](/ingredients/condition/weight-management).

## Mechanism of Action

Bilimbi's antioxidant effects are driven by its high phenolic and flavonoid content, which scavenge DPPH free radicals (IC50 5.63–10.26 μg/mL) and nitric oxide radicals (IC50 108.10 μg/mL), thereby mitigating oxidative stress-induced cellular damage (PMID 34132178). LC-QTOF-MS/MS analysis has identified key bioactive constituents—including flavonoid glycosides, phenolic acids, and tannins—that inhibit xanthine oxidase via competitive binding at the molybdenum cofactor active site, reducing uric acid production and [reactive oxygen species](/ingredients/condition/antioxidant) generation (PMID 30297618). Bilimbi phytocompounds, particularly phytol, activate thermogenic pathways by upregulating uncoupling protein 1 (UCP1) expression in adipocytes, promoting brown fat-like differentiation and energy expenditure relevant to anti-obesity mechanisms (PMID 39698098). Additionally, compounds such as hexadecanoic acid and 4H-pyran-4-one contribute to [antimicrobial](/ingredients/condition/immune-support) activity by disrupting bacterial cell membrane integrity, as evidenced by inhibition zones against oral cavity pathogens including Staphylococcus aureus and Streptococcus mutans (PMID 36284968; PMID 34422535).

## Clinical Summary

Current evidence for bilimbi is limited to in vitro phytochemical studies and [antimicrobial](/ingredients/condition/immune-support) assays, with no human clinical trials reported. Laboratory studies demonstrate antimicrobial zones of inhibition ranging from 7-14 mm against Bacillus cereus and E. coli, and cytotoxic activity with LD50 values of 8.89-20.3 μg/mL in brine shrimp assays. While animal studies suggest cardioprotective and [hepatoprotective](/ingredients/condition/detox) effects, human safety and efficacy data are lacking. The evidence strength remains preliminary pending controlled clinical trials.

## Nutritional Profile

- Dietary Fiber: Aids digestion and supports [gut microbiome](/ingredients/condition/gut-health) health.
- Vitamin C: Enhances [immunity](/ingredients/condition/immune-support) and promotes [collagen synthesis](/ingredients/condition/skin-health).
- Potassium: Supports electrolyte balance and cardiovascular function.
- Magnesium: Contributes to nerve function and muscle performance.
- Oxalic Acid: Acts as a natural astringent, supporting kidney health.
- Polyphenols: Provide potent [antioxidant](/ingredients/condition/antioxidant) and [anti-inflammatory](/ingredients/condition/inflammation) benefits.
- Flavonoids: Support [cardiovascular health](/ingredients/condition/heart-health) and cellular protection.

## Dosage & Preparation

- Common forms: Fresh fruit, dried powder, liquid extracts, and supplements.
- Traditional culinary uses: Consumed raw, in chutneys, pickles, juices, and as a souring agent in curries.
- Dosage: 1–2 fresh fruits (30–60g) daily for metabolic and [cardiovascular](/ingredients/condition/heart-health) benefits; 500–1,000 mg of extract for [antioxidant](/ingredients/condition/antioxidant) and [immune support](/ingredients/condition/immune-support).
- Timing: Best consumed with meals or as part of functional preparations.

## Safety & Drug Interactions

Bilimbi fruit is notably high in oxalic acid (up to ~10.5 mg/g), which poses a significant risk of acute oxalate nephropathy and kidney injury when consumed in excessive quantities, particularly in individuals with pre-existing renal impairment; multiple case reports in the literature have documented acute kidney failure following large-volume bilimbi juice consumption (PMID 28216948). Due to its demonstrated hypolipidemic and hypoglycemic effects, bilimbi may potentiate the actions of antidiabetic medications (e.g., metformin, sulfonylureas) and lipid-lowering drugs (e.g., statins), warranting caution and medical supervision when used concurrently. Heavy metal analysis by Soumya & Nair (2016) revealed that bilimbi fruit can bioaccumulate metals such as cadmium and lead depending on soil conditions, emphasizing the importance of sourcing from uncontaminated environments (PMID 27080855). While specific CYP450 interaction data for bilimbi are limited, its rich flavonoid profile suggests potential inhibition of CYP3A4 and CYP1A2 enzymes, similar to other flavonoid-rich tropical fruits, which could alter the [metabolism](/ingredients/condition/weight-management) of co-administered pharmaceuticals.

## Scientific Research

A comprehensive review by Alhassan et al. (2016) in the Journal of Pharmacy and Bioallied Sciences documented bilimbi's extensive ethnomedicinal uses and pharmacological properties including hypoglycemic, hypolipidemic, [antimicrobial](/ingredients/condition/immune-support), and [antioxidant](/ingredients/condition/antioxidant) activities (PMID 28216948). Ahmed et al. (2018) in Antioxidants (Basel) used LC-QTOF-MS/MS and molecular docking to identify bioactive constituents in bilimbi leaves responsible for potent antiradical and xanthine oxidase inhibitory activity, a key mechanism in managing hyperuricemia and gout (PMID 30297618). Chau et al. (2023) published in Applied Nanoscience an RP-HPLC-optimized extraction of flavonoids from bilimbi fruits demonstrating a strong correlation between total flavonoid content and antimicrobial efficacy (PMID 34422535). Most recently, Md Fauzi et al. (2024) in Heliyon showed that bilimbi-derived phytol and related phytocompounds induced thermogenic brown adipocyte differentiation in vitro, pointing to potential anti-obesity applications (PMID 39698098).

## Historical & Cultural Context

A staple in Southeast Asian cuisine and folk healing traditions for millennia, Bilimbi has been used to impart sourness to dishes and as a home remedy. In Ayurvedic and Southeast Asian traditional medicine, it was brewed into herbal teas for [digestion](/ingredients/condition/gut-health), blood sugar balance, and liver support, and applied topically for skin conditions.

## Synergistic Combinations

Role: Polyphenol/[antioxidant](/ingredients/condition/antioxidant) base
Intention: Gut & [Microbiome](/ingredients/condition/gut-health) | Immune & [Inflammation](/ingredients/condition/inflammation)
Primary Pairings: Turmeric (Curcuma longa); Cinnamon (Cinnamomum verum); Berberine (Berberis aristata); Hawthorn Berry (Crataegus monogyna)

## Frequently Asked Questions

### What are the main health benefits of bilimbi fruit?

Bilimbi benefits include potent antioxidant activity (DPPH scavenging IC50 as low as 5.63 μg/mL), antimicrobial effects against oral and pathogenic bacteria, and potential anti-obesity properties through thermogenic adipocyte differentiation (PMID 39698098). It is also traditionally used to support cardiovascular health by improving lipid profiles and managing blood sugar levels, with pharmacological review confirming hypolipidemic and hypoglycemic activities (PMID 28216948).

### Is bilimbi safe to eat and are there any side effects?

Bilimbi is generally safe in moderate dietary amounts, but its high oxalic acid content can cause acute oxalate nephropathy and kidney injury when consumed excessively, especially as concentrated juice. Individuals with kidney disease, kidney stones, or those on dialysis should avoid bilimbi. It may also interact with blood sugar-lowering and cholesterol-lowering medications (PMID 28216948).

### What nutrients and bioactive compounds are found in bilimbi?

Bilimbi contains phenolic compounds (~209.25 mg GAE/g), flavonoids (quantified via RP-HPLC, PMID 34422535), vitamin C, oxalic acid, and bioactive phytocompounds including phytol, 4H-pyran-4-one, hexadecanoic acid, and various flavonoid glycosides identified through LC-QTOF-MS/MS analysis (PMID 30297618). It also contains minerals, though heavy metal content can vary by growing conditions (PMID 27080855).

### Can bilimbi help with weight loss or obesity?

Emerging in vitro research published in Heliyon (2024) demonstrated that phytol and other bilimbi phytocompounds induce thermogenic brown adipocyte differentiation by upregulating UCP1 expression, which increases energy expenditure (PMID 39698098). While these findings are promising for anti-obesity applications, human clinical trials are needed before bilimbi can be recommended as a weight management intervention.

### Does bilimbi have antimicrobial or antibacterial properties?

Yes, both aqueous and alcoholic extracts of bilimbi have demonstrated significant antibacterial activity. Mohammed Atiyah et al. (2022) showed bilimbi leaf extracts effectively inhibited bacteria isolated from the oral cavity (PMID 36284968), while Makky et al. (2022) confirmed ethanolic bilimbi extracts exhibited antimicrobial activity in vitro (PMID 34132178). Flavonoid-rich fruit extracts optimized via RP-HPLC also showed a strong correlation between flavonoid concentration and antibacterial potency (PMID 34422535).

### Can bilimbi interact with blood pressure or cholesterol medications?

Bilimbi may have mild blood pressure-lowering and lipid-modifying effects, so individuals taking antihypertensive or statin medications should consult their healthcare provider before consuming large quantities as a supplement. While whole fruit consumption is generally safe, concentrated bilimbi extracts could potentially potentiate medication effects. Medical supervision is recommended to prevent additive or synergistic interactions.

### Who should avoid bilimbi or use it with caution?

Individuals with kidney disease or those prone to kidney stones should limit bilimbi consumption due to its oxalate content, which can contribute to stone formation. People taking blood thinners, those with gastric ulcers, or those with severe acid reflux may need to moderate intake given bilimbi's high acidity. Pregnant and nursing women should consult healthcare providers before using bilimbi supplements, though moderate consumption of whole fruit is typically considered safe.

### What is the best form of bilimbi for maximum antioxidant and health benefits?

Fresh whole bilimbi fruit provides the highest level of bioactive compounds, including vitamin C and phenolic antioxidants, especially when consumed raw or minimally processed. Powdered or freeze-dried forms preserve most nutrients better than heat-processed juices or cooked preparations, which can degrade heat-sensitive vitamins. Standardized extracts concentrated for specific bioactive compounds may offer higher potency per dose, though whole fruit provides synergistic benefits from multiple phytochemicals working together.

## References

Alhassan AM et al. (2016). Averrhoa bilimbi Linn.: A review of its ethnomedicinal uses, phytochemistry, and pharmacology. Journal of Pharmacy and Bioallied Sciences. PMID: 28216948 | Mohammed Atiyah M et al. (2022). Phytochemical Screening and Antibacterial Activities of Aqueous and Alcoholic Extracts of Averrhoa bilimbi Leaf against Bacteria Isolated from Oral Cavity. Archives of Razi Institute. PMID: 36284968 | Md Fauzi F et al. (2024). Phytol and bilimbi phytocompounds induce thermogenic adipocyte differentiation: An in vitro study on potential anti-obesity effects. Heliyon. PMID: 39698098 | Makky EA et al. (2022). In vitro Antioxidant and Antimicrobial Studies of Ethanolic Plant Extracts of P. granatum, O. stamineus, A. bilimbi, M. nigra, and E. longifolia. Current Pharmaceutical Biotechnology. PMID: 34132178 | Ahmed QU et al. (2018). Antiradical and Xanthine Oxidase Inhibitory Activity Evaluations of Averrhoa bilimbi L. Leaves and Tentative Identification of Bioactive Constituents through LC-QTOF-MS/MS and Molecular Docking Approach. Antioxidants (Basel). PMID: 30297618 | Rohmah EA et al. (2020). Larvicidal Activity and Histopathological Effect of Averrhoa bilimbi Fruit Extract on Aedes aegypti from Surabaya, Indonesia. Journal of Parasitology Research. PMID: 32802485 | Chau TP et al. (2023). Optimization of extraction and quantification of Flavonoids from Averrhoa bilimbi fruits using RP-HPLC and its correlation between total flavonoids content against antimicrobial activity. Applied Nanoscience. PMID: 34422535 | Soumya SL et al. (2016). Assessment of heavy metals in Averrhoa bilimbi and A. carambola fruit samples at two developmental stages. Environmental Monitoring and Assessment. PMID: 27080855

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