Soapberry

Soapberry (Sapindus spp.): A Comprehensive Reference

1. Identity: Botanical Names, Natural Sources, and Common Forms

1.1 Taxonomy and Botanical Identity

The Sapindus genus, commonly known as soapberry trees, comprises deciduous species famous for their natural cleansing properties and significant ecological roles. Scientifically, the primary commercial species is Sapindus mukorossi Gaertn., which belongs to the Sapindaceae family and is part of the genus Sapindus, comprising about 12 species of soapberry trees and shrubs known for their saponin-rich fruits. A second widely studied species, Sapindus saponaria L., is commonly known as the Western Soapberry, Wingleaf Soapberry, or Tropical Soapberry, and carries Spanish common names including Jaboncillo, Boliche, and Amolillo.

The genus name Sapindus comes from the Latin words sapo, meaning soap, combined with indus, in reference to the West Indies. Its specific epithet saponaria means "soapy." As of 2026, Plants of the World Online includes 20 accepted species in the genus Sapindus. Other medicinally relevant species include Sapindus trifoliatus L. (South Indian soapnut) and Sapindus rarak DC. (Southeast Asia).

Sapindus mukorossi is commonly called the Chinese soapberry, Indian soapnut, or reetha, and is a deciduous tree valued for its ecological and economic significance. It is found in the upper reaches of the Indo-Gangetic plains, Shivaliks, and sub-Himalayan tracts. It is widely distributed across India, Nepal, China, Japan, and parts of Southeast Asia, thriving in subtropical and tropical climates.

Sapindus saponaria (Western Soapberry) is found in the south-central and southwestern United States — including Arizona, Texas, Kansas, and Louisiana — and is also native to all of Mexico southward to South America. This species has a very wide native range throughout the Americas, ranging from Kansas east to Florida and the West Indies, and south to Paraguay.

1.2 Plant Description

The soapberry (S. mukorossi) is a deciduous tree that can grow up to 20 meters in height. Its crown has a globular shape with dense, leathery, and relatively thin foliage. Its leaves are alternate, pinnately compound, comprising 5–17 leaflets that are narrow and up to 18 cm long. The flowers are white and fruits are one-seeded berries with yellow pulp and a brown seed. The fruit is fleshy and globose, about ½ inch wide, with translucent flesh that is yellow, turning darker with age.

1.3 Common Names and Synonyms

S. mukorossi is commonly known by many names including soapberry, soapnut, washnut, aritha, dodan, and dodani. In India, it is known as reetha; in China, it is called mu huan zi. In Chinese folklore it is known as mu huan zi and has been traditionally used for treating coughing, excessive salivation, removing freckles, and whitening the skin.

1.4 Common Forms and Preparations

Soapberry is commercially and traditionally encountered in several forms:

• Dried pericarp (shell/husk): The dried outer shells of the drupes are the part most revered in Ayurveda, particularly for their skin- and hair-friendly properties.
• Aqueous or hydroalcoholic extract: Ethanolic extracts from pericarps are used in antimicrobial and pharmacological research.
• Seed oil: The seed oil contains abundant monounsaturated fatty acids, β-sitosterol, and δ-tocopherol.
• Powdered pericarp: Used in hair care products and traditional formulations.
• Shampoo and cosmetic preparations: In recent years S. mukorossi has attracted much attention for its fruits as ingredients of shampoo and cosmetic cleansers.
• Vaginal cream formulation (investigational): A cream formulation was prepared from soapberry saponins for human contraceptive application.
• Laundry "nuts": Soap nuts serve as eco-friendly alternatives to synthetic detergents and cleaning agents.

2. Traditional and Historical Use

2.1 South Asia — Ayurvedic and Unani Medicine

The soapberry has a long history of use in Asia, dating back thousands of years. In India, its fruit, known as reetha, has been used since ancient times as a natural detergent for washing clothes, hair, and skin, documented in Ayurvedic texts for its cleansing and medicinal properties. The "Historical Dictionary of Ancient India" explains soapnuts were found in a monastic complex dating back to the 6th century BC, and a paper titled "Some Notes on the History of Soap Nuts, Soap and Washermen of India — between 300 BC and AD 1900" hints at even earlier roots.

Traditional applications include its use in Ayurvedic and Unani medicine for treating ailments like cough, skin infections, and poisoning. Ayurvedic texts describe reetha as kashaya (astringent) and tikta (bitter), useful for balancing kapha and vata doshas, and promoting healthy skin, scalp, and circulation. Pericarps of Sapindus mukorossi have been traditionally used as an expectorant as well as a source of natural surfactant.

In traditional Ayurvedic use, the fruit is considered crucial in the treatment of numerous conditions including hypersalivation, acne, epilepsy, albinism, migraines, eczema, and psoriasis; the fruit paste is used as a febrifuge, and the powdered seeds are used to address tooth decay, rheumatoid arthritis, colds, constipation, and nausea.

2.2 Traditional Chinese Medicine

Sapindus mukorossi fruits have been used as an expectorant and natural surfactant in ancient China. Soapberry is a traditional medicinal plant in China where the fruit is the main part utilized. According to the Compendium of Materia Medica, an ancient Chinese pharmaceutical book, soapberry pericarp can be used to wash the hair and face to cure dandruff and freckles. In Traditional Chinese Medicine it has been used externally to clear phlegm, kill parasites, and relieve itching or swelling.

2.3 Indigenous Peoples of the Americas

Native to tropical regions of the Americas, Sapindus saponaria has been used for centuries by indigenous communities and traditional populations for personal care, cleaning, and other applications. Most notably — and the reason it is named soapberry — is for its use by indigenous peoples as a soap; the fruits are mashed in water to produce a soapy lather used for washing laundry, for personal hygiene, and for household cleaning.

The Kiowa applied a poultice of sap to wounds as a dermatological aid. Western soapberry was used by North American indigenous peoples to make arrows and for other uses; the Comanche used stems to make arrows for the aratsi game. Necklaces and buttons were made from the round dark brown seeds, and baskets from the wood.

Archaeological evidence confirms the antiquity of soapberry use; charred fragments of western soapberry wood were identified in Hinds Cave.

2.4 Other Regional Traditions

In countries like Japan and China, reetha has been used for centuries; in Japan it has been used as a "life-prolonging pericarp," and in China as a fruit for managing illnesses. Plants of the genus Sapindus have been used in traditional medicine for the treatment of ulcers, external wounds, inflammation, epilepsy, dental caries, arthritis, joint pain, gout, and rheumatism. In Brazil, the fruit of Sapindus saponaria L. is employed in folk medicine in the treatment of ulcers and external wounds.

3. Key Constituents and Active Compounds

3.1 Triterpenoid Saponins

The main phytoconstituents isolated and identified from different parts of this plant are triterpenoidal saponins of oleanane, dammarane, and tirucullane type. Triterpenoid saponins are the important secondary metabolites and bioactive constituents of soapberry (Sapindus mukorossi Gaertn.) and are widely used in medicine and toiletry products.

A large amount of saponins, amounting to about 10.1–11.5% of the fruit, are present in the pericarp, where this value increases to 56.5% in the drupe. The fruit also contains about 10% sugars and mucilage.

Specific named saponins isolated from S. mukorossi include the sapinmusaponin series. Six saponins — sapinmusaponin K, L, M, N, O, and P — have been identified and fully characterized from the fruits and galls of Sapindus mukorossi. The fruit pericarp of S. mukorossi is rich in saponins such as Sapindoside A, B, and C, which are bioactive compounds with several potential applications ranging from surfactants to physiologically active agents.

Six new fatty esters of tetracyclic triterpenoid compounds together with a known acyclic sesquiterpenoidal glycoside have been isolated from the fruits of Sapindus mukorossi. A novel acetylated triterpenoid saponin, hederagenin-3-O-β-D-xylopyranosyl(2→1)-[3-O-acetyl-α-L-arabinopyranosyl-28-O-α-L-rhamnopyranosyl ester, has been isolated from pericarps of Sapindus mukorossi Gaertn.

3.2 Other Phytochemical Constituents

S. mukorossi leaves contain many bioactive compounds including alkaloids, flavonoids, phenols, carbohydrates, terpenoids, and saponins. The stems also include flavonoid, phenolic, and polysaccharide constituents. The kernel mass consists of approximately 40% oil, which is a mixture of medium-chain monounsaturated and polyunsaturated fatty acids, mostly of oleic and linoleic acid, along with triglycerides.

From the fruit of S. saponaria, anti-inflammatory and antioxidant compounds stigmasterol, oleanolic acid, luteolin, luteolin 8-C-β-glucoside (orientin), luteolin 6-C-β-glucoside (isoorientin), luteolin 7-O-β-glucuronide, and rutin have been isolated. Previous studies have reported that the main chemical constituents of the soapberry pericarp are terpenoids (especially triterpenoid saponins and sesquiterpenoid glycosides), phenylpropanoids, steroids, and saccharides.

3.3 Mechanisms of Action

Surfactant / Membrane-Active Properties: Saponins have a triterpenoid or steroidal backbone. Sugars are attached at one or more points of this structure, forming branched chains. This structure confers amphiphilic properties, giving saponins the ability to interact with both lipophilic and hydrophilic structures. The surfactant behavior lets them lower the surface tension in aqueous solutions and form micelles when reaching the critical micelle concentration (CMC). It also lets them interact with biological membrane layers that usually consist of phospholipids and cholesterol. This action may perturb the membrane and its function, leading to membrane perforation or complete lysis.

Antimicrobial Mechanism: Treatment of bacterial cells with S. mukorossi extract demonstrated an enhancement of bacterial total membrane permeability, and for the S. aureus strain a significant decrease in viability was noted, associated with a significant increase in cell membrane permeability.

Anti-inflammatory Mechanism: Studies on S. trifoliatus pericarp suggest that the cyclooxygenase (COX) and lipoxygenase pathways could be involved in anti-inflammatory activity. Flower water extract of S. mukorossi significantly inhibited the secretion of pro-inflammatory cytokines (TNF-α, IL-6, and IL-β) in lipopolysaccharide-stimulated THP-1 macrophages; transcriptome analysis showed that it may exert its anti-inflammatory effect via NOD-like receptor and JAK-STAT signaling pathways.

Antifungal Mechanism: Saponins from S. mukorossi inhibited in vitro mycelial growth in a dose-dependent manner; this inhibitory effect was attributed to impairment in membrane potential and integrity, induction of autophagic-like vacuoles, and disturbance in organellar homeostasis.

Spermicidal Mechanism: In vitro studies of Sapindus saponaria saponins showed total immobilization of sperm and 100% death via negative hypo-osmotic swelling, indicating complete membrane damage.

Bile Acid Interaction (Lipid Modulation): The ability of saponins to form large stable micelles with bile acids has important implications for dietary mechanisms. Saponins in food and feed increase fecal excretion of bile acids. Additionally, the incorporation of cholesterol into saponin micelles increases their size and aggregation level, resulting in solubility enhancement of cholesterol.

4. Scientific Evidence by Area of Use

4.1 Antimicrobial Activity

Evidence type: In vitro; some animal; very limited human/clinical.

The ethanolic extract from pericarps of S. mukorossi showed significant in vitro antimicrobial activity against various test organisms by agar well diffusion method, and the extract showed significant activity against test organisms as compared with positive controls. Antimicrobial activity was studied against bacterial strains including Shigella dysentriae and Staphylococcus aureus, and a zone of inhibition was observed.

Antibacterial activity of S. mukorossi flower water extract against Cutibacterium acnes demonstrated an inhibition diameter of 14.08 ± 0.63 mm in vitro.

A 2025 study published in Microorganisms examined the antibacterial effect of S. mukorossi aqueous extract in human saliva using an ex vivo model. The sample size was limited to seven participants, making this one of the very few studies with any human biological material, though still not a controlled clinical trial.

In synergy studies examining combinations of saponin-rich extracts with antibiotics at sub-inhibitory concentrations, 30 combinations were studied against bacterial strains: 17 (56.7%) showed synergism, 7 (23.3%) had an additive effect, 4 (13.3%) had no effect, and 2 (6.7%) had an antagonistic effect. For Candida strains, 8 combinations of saponin extracts and fluconazole were tested, and all (100%) exhibited synergism with fractional inhibitory concentration (FIC) values ranging from 0.31 to 0.50.

Overall, antimicrobial evidence is based on in vitro experiments and a small number of animal studies. No large, controlled human clinical trials evaluating soapberry as an antimicrobial agent have been published.

4.2 Antifungal Activity

Evidence type: In vitro; limited ex vivo; no controlled clinical trials.

Under the guidance of antifungal bioassay, four previously undescribed oleanane-type and one lupane-type triterpenoid saponins, along with twelve known analogues, were isolated from the extract of Sapindus mukorossi pulps and their antifungal activities were characterized. Three isolated compounds exhibited moderate anti-Trichophyton rubrum activities.

Extracts from the dried pericarp of Sapindus saponaria fruits were investigated for antifungal activity against clinical isolates of yeasts including Candida albicans and C. non-albicans from vaginal secretions of women with vulvovaginal candidiasis; four clinical isolates of C. albicans and single isolates of C. parapsilosis, C. glabrata, and C. tropicalis were used. The hydroalcoholic extract showed strong activity against a clinical isolate of C. parapsilosis, and the n-BuOH extract and one fraction showed strong activity against all isolates tested. These remain in vitro findings derived from clinical samples; there is no completed randomized clinical trial for soapberry as an antifungal agent.

4.3 Anti-inflammatory and Antioxidant Activity

Evidence type: In vitro; animal (rodent); no controlled human clinical trials.

The antioxidant, anti-inflammatory, analgesic, and antipyretic potential of the stem bark of soapnut (S. mukorossi) methanol extract and its derived fractions was investigated; bark was extracted with methanol and fractionated sequentially. Anti-inflammatory activity was assessed using carrageenan-induced paw edema, analgesic activity by hot plate latency test, and antipyretic activity by rectal temperature in Sprague-Dawley rats.

In vitro, flower water extract of S. mukorossi significantly inhibited the secretion of pro-inflammatory cytokines TNF-α, IL-6, and IL-β in LPS-stimulated THP-1 macrophages.

All anti-inflammatory and antioxidant evidence is preclinical (cell culture and rodent models). No peer-reviewed human clinical trials examining soapberry's anti-inflammatory effects have been identified.

4.4 Skin and Dermatological Applications

Evidence type: In vitro; animal wound models; no completed randomized controlled trials in humans for therapeutic use.

Research has demonstrated that oleanane-type triterpenoid saponins are speculated to contribute to skin-whitening, freckle-removing, and anti-acne activities of S. mukorossi saponin fractions.

S. mukorossi seed oil contains abundant monounsaturated fatty acids, β-sitosterol, and δ-tocopherol; in vitro tests showed that the seed oil prompted cell proliferation and migration capability of skin cells. In vivo excision wound analysis in animals exhibited accelerated wound healing after two days with growth of granulation tissue, absence of edema, and lower secretions compared to an untreated control group; wounds treated with the seed oil-containing hydrogels showed significant reduction in wound area at all experimental time points.

S. mukorossi hydrosol (SMH) powder diluted with water at a ratio of 1:2 reduced S. aureus colony counts by 60% (p < 0.05) in antibacterial testing; in vitro viability assays on CCD-966SK fibroblasts demonstrated enhanced cell survival, and scratch assays confirmed that SMH promoted fibroblast migration and significantly accelerated wound closure at 24 and 48 hours (p < 0.05).

S. mukorossi flower water extract exhibited antioxidant, antibacterial, and anti-inflammatory properties in in vitro experiments; RNA-seq analysis indicated it may alleviate inflammation by regulating the NOD-like receptor and JAK-STAT signaling pathways; the authors concluded it has shown potential for anti-acne efficacy as a natural raw material in cosmetics.

4.5 Spermicidal and Contraceptive Activity

Evidence type: In vitro; animal models; one small human pilot clinical study.

The fruits of S. mukorossi contain saponins which showed excellent spermicidal activity in vitro and in vivo animal experiments. In vitro studies demonstrated that saponins from S. mukorossi completely inhibited human sperm motility within 60 seconds at a minimum effective concentration (MEC) of 0.5 mg/mL.

A safety and tolerability pilot clinical study was organized to evaluate the contraceptive safety and efficacy of 2.5% CONSAP cream (containing S. mukorossi saponins) when used intravaginally before coitus. Women volunteers were instructed to use 2.5% CONSAP cream in a loading dose of 3 grams, 5–7 minutes before coitus, and present for a post-coital test the next morning. The study was conducted on 27 women volunteers at two centers. Volunteers were examined within 12 hours of coitus. The post-coital test showed immobile spermatozoa in vaginal and endocervical aspirates. This was a small uncontrolled pilot study with no comparator arm, and the result, while suggestive, is insufficient to establish clinical efficacy by modern standards.

4.6 Hepatoprotective Activity

Evidence type: In vitro (primary hepatocyte cultures) and in vivo (rodent) models only.

A study aimed to assess the hepatoprotective capacity of S. mukorossi and Rheum emodi extracts in CCl₄-treated male rats. Dried powder of S. mukorossi was extracted successively and primary rat hepatocyte monolayer cultures were used for in vitro studies. In vivo, the hepatoprotective capacity of the extract of the fruit pericarp of S. mukorossi was analyzed in liver-injured CCl₄-treated male rats. A protective activity could be demonstrated in the CCl₄-damaged primary monolayer culture, and extracts of the fruit pericarp of S. mukorossi (2.5 mg/mL) were found to have protective properties in rats as judged from serum marker enzyme activities.

Hepatoprotective activity was further demonstrated in CCl₄-damaged primary monolayer culture; in vivo studies showed pretreatment with total saponin fraction at 50, 100, and 150 mg/kg (per os, once daily for 4 days before CCl₄ introduction, continued for 3 days afterward) attenuated the acute increase in serum marker enzymes and considerably reduced histopathological alterations. These findings are preclinical; no human clinical trial data on hepatoprotection by soapberry exists.

4.7 Anti-Hyperglycemic and Anti-Hyperlipidemic Activity

Evidence type: Animal models only.

Extract obtained from the fruit of S. mukorossi strongly exhibited anti-hyperglycemic and anti-hyperlipidemic activities in streptozotocin-induced diabetic rats. The extract was also able to restore the haematological and histopathological changes of the pancreas toward normal. No human clinical studies have been conducted in this area.

4.8 Anticancer / Cytotoxic Activity

Evidence type: In vitro (cell lines) and limited animal models; no clinical trial data.

Isolated triterpenoid saponins from S. mukorossi displayed cytotoxic effects against human cancer cell lines in A-549 (lung carcinoma), MDA-231 (breast carcinoma), and PC-3 (prostatic carcinoma).

In vitro and in vivo research has demonstrated that S. mukorossi aqueous extract (SaM) contained polysaccharides mainly composed of myo-inositol, galactose, glucose, and fructose. In vitro treatment with SaM diminished proliferative potential of lung adenocarcinomic cells and induced intracellular oxidative stress and necrotic cell death; exposure to SaM also attenuated cell migration, demonstrating effectiveness at reducing the invasive property of malignant lung cells. Gene and protein expression studies indicated that SaM altered the expression of NF-κB, ERK2, MMP9/12, and tumor suppressor p53 in A549 cells. These are preliminary, cell-based findings and are far from constituting evidence for therapeutic use in humans.

4.9 Molluscicidal and Insecticidal Activity

Bioassay data revealed that saponins isolated from S. mukorossi were molluscicidal, causing 70–100% mortality at 10 ppm against the golden apple snail. This activity has public health implications for snail-borne parasite control but is not a human health application.

4.10 Oral Health Applications

One published study examined the efficacy of adjunctive S. mukorossi therapy on clinical, radiographic, and cytokine profiles of diabetic patients with peri-implantitis. This appears to be one of the very few clinical-context studies, though full data from the trial are limited in the available citations. In vitro antimicrobial activity of Sapindus mukorossi and Emblica officinalis against dental caries pathogens has also been investigated.

5. Body Systems Associated with Soapberry

• Integumentary system (skin and hair): Cleansing, anti-acne, wound healing, anti-dandruff, antifungal (dermatophytes), hyperpigmentation. Modern pharmacological studies have shown that soapberry pericarp has anti-inflammatory, anti-tumor, anti-bacterial, anti-viral, hepatoprotective, insecticidal, and other bioactivities.
• Reproductive system: Spermicidal/contraceptive activity (intravaginal), anti-Trichomonas activity.
• Hepatic system: Hepatoprotective activity against chemical-induced liver damage (preclinical).
• Metabolic system: Anti-hyperglycemic and anti-hyperlipidemic effects (animal models only).
• Respiratory system: Traditionally used as an expectorant.
• Neurological system (traditional): The fruits, leaves, and roots have been utilized in traditional medicine to treat migraine, epilepsy, and other conditions.
• Oral cavity: Anti-caries and peri-implant applications under investigation.
• Immune / inflammatory system: Anti-inflammatory via COX/lipoxygenase and cytokine pathways (preclinical).

6. Dosage Forms and Dosages Reported in Studies

The following dosages are reported specifically in the cited scientific literature. These are not recommendations.

• Hepatoprotective animal study (oral saponin fraction): Pretreatment with total saponin fraction at 50, 100, and 150 mg/kg per os, once daily for 4 days before CCl₄ introduction, continued for 3 days afterward, attenuated serum marker enzyme elevation in rats.
• Hepatoprotective in vivo study (extract concentration): Extracts of the fruit pericarp of S. mukorossi at 2.5 mg/mL showed protective properties in CCl₄-treated rats.
• Spermicidal human pilot study (vaginal cream): A 2.5% CONSAP cream was used intravaginally in a loading dose of 3 grams, applied 5–7 minutes before coitus.
• Spermicidal in vitro — S. mukorossi saponins: MEC = 0.5 mg/mL; sperm motility was completely inhibited within 60 seconds.
• Spermicidal in vitro — S. saponaria saponins: MEC = 1.25 mg/mL, producing total immobilization of sperm and 100% death within 20 seconds.
• Antibacterial ex vivo (saliva model): SMH powder diluted with water at a ratio of 1:2 reduced S. aureus colony counts by 60%.
• Saponin content of fruit pericarp: Saponins amount to approximately 10.1–11.5% of the whole fruit and up to 56.5% of the dried drupe.

Although a number of phytochemicals present in Sapindus mukorossi have been isolated and identified, their pharmacological and biological studies in terms of human welfare dosing have not been fully established. No standardized dosage for any oral therapeutic indication has been established through controlled clinical trials.

7. Safety Considerations and Known Interactions

7.1 Oral Toxicity

The fruit of western soapberry is mildly toxic if ingested orally due to the high saponin content, though the high saponin content also allows the fruit to be used as a form of lathering soap. The foaming property of the saponins makes the berries a useful detergent, but when taken internally the chemicals disrupt animal cells; hence soapberry fruit is considered toxic.

When someone ingests parts of the soapberry plant, nausea and vomiting often occur within a few hours; these symptoms can last for several hours, leading to dehydration if not managed properly. Diarrhea is another frequent symptom. In more serious cases, neurological symptoms may arise, including dizziness and confusion, which can escalate to seizures. Cardiovascular issues can also manifest, such as irregular heartbeat and low blood pressure.

7.2 Saponin-Specific Toxicological Properties

Saponins interact with biological membrane layers that consist of phospholipids and cholesterol; this action may perturb the membrane and its function, leading to membrane perforation or complete lysis. This is the primary toxicological mechanism at play with excessive internal exposure, and it underlies the piscicidal and molluscicidal activity of the plant noted in research.

The pericarp of Sapindus mukorossi has been shown to be highly toxic to fish, yielding 100% mortality within 12 hours in test models, with LD values ranging between 3.5 ppm and 10 ppm at 48 hours. This extreme aquatic toxicity is important context for environmental handling of concentrated extracts, though direct relevance to human use at conventional preparation concentrations differs substantially.

7.3 Topical Versus Internal Use

Despite the mild oral toxicity, the fruits of soapberry species may have topical health benefits. The bulk of the safety literature supports external and topical use as comparatively safer than internal consumption of concentrated preparations.

7.4 Reproductive Safety

The fruits of S. mukorossi contain saponins which showed excellent spermicidal activity in vitro and in vivo animal experiments. The spermicidal activity of soapberry saponins at sub-milligram per milliliter concentrations raises considerations about reproductive exposure, particularly in the context of vaginal applications.

7.5 Anti-platelet Activity

Five new tirucallane-type saponins (sapinmusasaponins) from the galls of Sapindus mukorossi showed moderate anti-platelet aggregation activity. Individuals using anticoagulant or antiplatelet medications should be aware of this potential interaction, although no human pharmacokinetic studies confirming this interaction have been published.

7.6 Anxiolytic and Neurological Effects in Animal Studies

Extract of S. mukorossi has exhibited anxiolytic activity in mice and antiepileptic activity has been studied in rats. The neurological activity of soapberry constituents in animal models indicates potential CNS effects; interaction with CNS-active medications cannot be ruled out, though human data are absent.

7.7 Overall State of Safety Evidence

The use of Sapindus mukorossi in folk medicine worldwide is supported by scientific studies demonstrating efficacy of extracts in various experimental models, including antibacterial, insecticidal, spermicidal, anti-trichomonas, antitumor, hepatoprotective, anxiolytic, molluscicidal, fungicidal, anti-inflammatory, and piscicidal activities. However, the pharmacological and biological studies in terms of human welfare have not been fully studied. No large-scale human safety studies have been completed. The absence of clinical trial data means that safe oral dosage ranges for human use cannot be stated with confidence from the published literature.

References

• Yoshikawa M, et al. Chemical constituents of Sapindus mukorossi Gaertn. (Sapindaceae). PubMed PMID: 16414745.
• Sharma A, et al. A New Triterpenoid Saponin and Antimicrobial Activity of Ethanolic Extract from Sapindus mukorossi Gaertn. Journal of Chemistry, 2013.
• Lou HX, et al. Triterpenoid saponins from the pulp of Sapindus mukorossi and their antifungal activities. PubMed PMID: 29257999.
• New triterpenoid saponin and oligosaccharide isolated from the fruits of Sapindus mukorossi. PubMed PMID: 24800793.
• Huang HC, et al. Triterpenoid saponins from the fruits and galls of Sapindus mukorossi. PubMed PMID: 18329676.
• Sochacki M, Vogt O. Triterpenoid Saponins from Washnut (Sapindus mukorossi Gaertn.) — A Source of Natural Surfactants and Other Active Components. Plants (Basel). 2022;11(18):2355. PMC9502486.
• Saponin fraction from Sapindus mukorossi Gaertn as a novel cosmetic additive. PubMed PMID: 33152431.
• Shah M, Parveen Z, Khan MR. Evaluation of antioxidant, anti-inflammatory, analgesic and antipyretic activities of the stem bark of Sapindus mukorossi. BMC Complement Med Ther. 2017. PMC5723046.
• Evaluation of Sapindus mukorossi Gaertn Flower Water Extract on In Vitro Anti-Acne Activity. PMC12110581.
• Hepatoprotective activity of Sapindus mukorossi and Rheum emodi extracts: In vitro and in vivo studies. PMC2708371.
• Effects of Sapindus mukorossi Seed Oil on Skin Wound Healing: In Vivo and in Vitro Testing. PMC6567820.
• Aqueous extract of Sapindus mukorossi induced cell death of A549 cells and exhibited antitumor property in vivo. PMC5859273.
• Upadhyay A, Singh DK. Pharmacological effects of Sapindus mukorossi. Revista do Instituto de Medicina Tropical de São Paulo. 2012.
• Integrative analysis of microRNAs and mRNAs reveals regulatory networks of triterpenoid saponin metabolism in Soapberry (Sapindus mukorossi Gaertn.). PMC9869041.
• Metabolomics analysis of the soapberry (Sapindus mukorossi Gaertn.) pericarp during fruit development and ripening based on UHPLC-HRMS. Scientific Reports. 2021. PMC8172880.
• Sapindus mukorossi as a Bioenhancer for the Biocidal Action of Polymyxin B. PMC12423858.
• Clinical Evaluation of Vaginal Contraceptive Cream of Sapindus mukorossi (CONSAP): A Pilot Study. Academia.edu.
• Nature-inspired male contraceptive and spermicidal products. Phytochemistry Reviews. Springer. 2020.
• Suhagia BN, et al. Sapindus mukorossi (Areetha): An Overview. International Journal of Pharmaceutical Sciences and Research.
• Sapindus mukorossi: A Complete Review on Pharmacology, Phytochemistry and Toxicological Data. International Journal of AYUSH. 2023.
• Wikipedia: Sapindus saponaria.
• Wikipedia: Sapindus genus.
• Sapindus mukorossi — ScienceDirect Topics overview.
• Saponin-Based, Biological-Active Surfactants from Plants. IntechOpen. 2017.
• Antibacterial Effect of Sapindus mukorossi Aqueous Extract in Human Saliva — A Pilot Translational Study with an Ex Vivo Model. Microorganisms. 2025.
• Shah M, et al. Evaluation of antioxidant, anti-inflammatory, analgesic and antipyretic activities of the stem bark of Sapindus mukorossi. BMC Complementary Medicine and Therapies. 2017.