Marking nut tree

Other Names

AgnikaAgnimukhaAgnimukhiAhvalaAlakkuceruAlakkucheruanacarde d'OrientAnacardium latifolium Lam.Anacardium longifolium Lam.Anacardium officinale Pritz.Anacardium officinarum Gaertn.Anacardium orientale Steud.Anacardium solitarium StokesArshastahArudhkhArushkaraArutkaramBaladurBaliaBeladinBelatakBhallaathakiBhallatakaBhallatakahBhallatamuBhalliBhelaBhelatukiBhilamoBhilanvanaBhilavaBhilawaBhilawanBhillavaBhilmaBhilvaBibbaBibhaBiboBibwaBiladurCassuvium anacardium (L.f.) KuntzeCassuvium longifolium (Lam.) KuntzeCenkottaiCeraCeraankottaiCerkkottaDhanurbijaDhobi nut treeErimukiGeeru beejaGerkayiGeruGoddugeruGudovaHab-el-kalbInk nutsJeediKaduKerubijaKohakaMalacca bean treeMarany nutMarking nutMarkingnut treeOriental cashewostindischer TintenbaumPhobi nut-treeSemecarpus anacardiumSemecarpus anacardium L.f.Semecarpus anacardium var. cuneifolius DC.Semecarpus cuneifolius (DC.) Roxb.Semecarpus latifolius Pers.Semecarpus mangifera Wight & Arn.SengottaiSeraangottaiSeran kottaiShengottaShentaShophakrutSimidiTailabijaThenkottaThummeda maamidiVahnihVarnish treeVira vriksha

Synopsis

Marking Nut Tree (Semecarpus anacardium L.f.): A Comprehensive Reference

1. Identity and Botanical Classification

Taxonomic and Nomenclatural Identity

Semecarpus anacardium belongs to the family Anacardiaceae, genus Semecarpus, with the species name anacardium. The scientific name was assigned by Carl Linnaeus and published in 1753. The plant carries a number of synonyms, including Bhela, Bhelatuki (Hindi and Bengali), Balia (Oriya), and marking nut tree or Oriental cashew (English). In Sanskrit it is most widely known as Bhallataka, and in Hindi as Bhilawa or Bhilwa.

Additional vernacular names include Ahvala, Arshastah, Arudhkh, Vahnih (Sanskrit), Bhilma, Bhela, Kohaka, Bibba (Hindi and Marathi), Kadu (Kannada), Geru (Malayalam), and Bhilamo (Gujarati).

Botanical Description and Distribution

Semecarpus anacardium is a deciduous tree that originates from India, Sri Lanka, and tropical Asia. It is a small to medium-sized deciduous tree that can reach a height of 25 metres, though it is usually smaller. The height of the tree is normally 12–15 m. The leaves are large and simple, up to 60 cm long and 30 cm wide. Leaves are oblong, simple, and pubescent beneath, measuring 15–30 cm. Tiny yellowish-green flowers appear in drooping clusters, followed by distinctive drupes — yellow-green fruits with a black-striped, kidney-shaped nut inside (the "marking nut").

Like the closely related cashew, the fruit is composed of two parts: a reddish-orange accessory fruit and a black drupe that grows at the end. The nut is about 25 millimetres (1 in) long, ovoid, and smooth, with a lustrous black surface. The tree is distributed across Bihar, Assam, West Bengal, Orissa, Madhya Pradesh, Maharashtra, Goa, Karnataka, and Tamil Nadu, found in moist deciduous and semi-evergreen forests.

Common Names and Common Preparations

Possibly best known for its use in making a permanent marking ink, this multi-purpose tree also provides food, medicines, and oil. Bhilwanols, phenolic compounds, biflavonoids, sterols, and glycosides are the important chemical constituents reported from this plant. The pericarp of the fruit contains a bitter and powerful astringent principle which is used as a substitute for marking ink, thus giving the tree the name "marking nut tree."

The plant is classified in Ayurveda under the category of Upavisha (semi-toxic plants). It is mentioned under the Upavisha group in Ayurvedic classics and is described as a poisonous medicinal plant in the Drugs and Cosmetics Act (India), 1940. The fruit of Bhallataka is used either as a single drug or as an ingredient in many compound formulations of Indian systems of medicine to cure many diseases.

2. Traditional and Historical Uses

Ayurvedic Classical Texts

References to Semecarpus anacardium date back to the early Ayurvedic compendia. In the Sushruta Samhita, it is noted under "Visha Dravya" (poisonous substances), used with care to treat ulcerative skin lesions and refractory arthritis.

In the Charaka Samhita, S. anacardium has been classified as a promoter of digestion, corrective of excessive urination, curative of obstinate skin diseases, and has been prescribed for counter-poisoning. In the Sushruta Samhita, plant nut preparations have been recommended for the treatment of intestinal parasites, fever, jaundice, excessive menstruation, ulcers, obesity, and uterine and vaginal discharges.

Ayurveda and Siddha Systems

Semecarpus anacardium, commonly known as marking nut in English, is an important medicinal plant in Ayurveda, Siddha, and various folk medicines of India. The seeds and oil extracted from Semecarpus anacardium were traditionally employed in remedies for a wide range of ailments. Ancient texts describe its application in treating skin disorders such as eczema and leprosy, and it was recognized as a potent agent for stimulating digestive fire (Agni), promoting appetite, and alleviating digestive complaints.

The fruit of Bhallataka is regarded as a potent drug for nervous debility, rheumatism, epilepsy, sciatica, asthma, and many more diseases. After detoxification, fruits have also been utilized to treat asthma, piles, leprosy, arthritis, and skin conditions such as leukoderma.

Within the Siddha tradition, Serankottai (marking nut) Nei is a medicinal ghee preparation. The nut extract is used to treat tuberculosis, cancer, lung infections, neurological discomfort, and autoimmune diseases such as rheumatoid arthritis and osteoarthritis. Another modified Siddha formulation, Kalpaamruthaa, includes nut milk extract, dried powdered Emblica officinalis fruit, and honey; this formulation has been tested for a variety of disorders, exhibiting analgesic, antipyretic, anticarcinogenic, and anti-arthritic activity.

Medieval and Cross-Cultural Historical Use

In medieval times, Semecarpus anacardium was thought to aid in memory retention, for which cause the following dictum became widespread among Jewish scholars: "Repeat [your lessons], and repeat [your lessons], but never stand in need of the marking nut!"

Colonial botanists documented cases of contact dermatitis among collectors, prompting more refined cleansing protocols by the 19th century. Across cultures — Sri Lankan Siddha, Chinese folk medicine, and tribal remedies in Eastern India — the nut's value lay in clearing stubborn skin blotches and easing chronic joint pain.

Traditional Preparations

Traditionally, Ayurvedic practitioners use the kernel (nut) and sometimes the root bark. In traditional Indian villages, local healers applied a paste of roasted nut powder with ginger juice to psoriasis patches. The nut was also prepared as a milk extract (ksheerapaka) — the nut boiled in milk — to reduce its inherent toxicity before internal administration. Semecarpus anacardium (Bhallataka) is traditionally given with milk in Ayurveda. When toxicity studies were carried out in animals there was mortality, which was nullified when the plant was co-administered with milk.

Numerous traditional formulations are available on the market; among the more common are Bhallatakasav, Bhallatak Parpati, Amritbhallatak Avaleha, Suran vatak, Narsimha choorna, and Sanjeevani Vati. In herbal combinations, Semecarpus anacardium is most famous as a key ingredient in the classical Ayurvedic formula "Arogyavardhini Vati," which supports liver health, detoxification, and metabolic balance.

3. Key Chemical Constituents and Active Compounds

Overview of Phytochemical Composition

Phytochemical analyses of Semecarpus anacardium nut show that it contains a variety of biologically active compounds such as biflavonoids, phenolic compounds, bhilawanols, minerals, vitamins, and amino acids, which show various medicinal properties. The seeds are rich in various bioactive compounds such as flavonoids, alkaloids, and terpenoids, which are responsible for its health benefits.

Tarry Oil Fraction (Pericarp)

The Bhallataka Nut Shell Liquid (BNSL) present in the pericarp of the fruit contains tarry oil consisting of anacardic acid (90%) and cardol (10%). The major constituent of the tarry oil is anacardic acid and bhilawanol, a mixture of 3-n-pentadec(en)yl catechols. Bhilawanol A and B are known as urushiols, and anacardic acid is closely related to urushiol.

Bhilwanol from fruits was shown to be a mixture of cis- and trans-isomers of urshenol; this compound consists mainly of 1,2-dihydroxy-3(pentadecadienyl 8′,11′)benzene and 1,2-hydroxy-3(pentadecadienyl 8′)benzene.

The crushed pericarp, on extraction with acetone, gives a dark-coloured oil which on distillation yields a light yellow oil, semecarpol (a monophenol), and a golden yellow oil, bhilawanol.

Biflavonoids

Other components isolated include anacardoside, semecarpetin, nallaflavanone, jeediflavanone, semecarpuflavanone, galluflavanone, anacarduflavone, mono-olefin I, diolefin II, bhilawanol-A, bhilawanol-B, amentoflavone, tetrahydroamentoflavone, semicarpol, anacardic acid, and tetrahydrobustaflavone.

Key characterised constituents include 3-ethoxy-N,N-diethyl-4-hydroxybenzamide, amentoflavone, anacardic acid, anacardoside, bhilawanol A, cardol, guaiacin, copper(I) phenoxide, various amino acids (e.g., DL-arginine, L-leucine, L-methionine), flavanones (e.g., galluflavanone, jeediflavanone, nallaflavanone), fatty acids (e.g., oleic, palmitic, tetradecanoic acids), and other compounds such as riboflavin, pyrocatechol, and tetrahydroamentoflavone. Over thirty bioactive compounds have been identified, isolated, and characterised.

Anacardic Acid

In an assay of antioxidant activity of alkyl phenols in cashews, a mixture of anacardic acids showed higher antioxidant capacity compared to cardols and cardanols. The antioxidant capacity of anacardic acid is more related to the inhibition of superoxide generation and xanthine oxidase than to the scavenging of hydroxyl radicals, and the C₁₅-alkenyl side chain is largely associated with this activity.

4. Established Mechanisms of Action

Anti-Inflammatory Mechanisms

Bioactivity-guided fractionation of the ethyl acetate extract led to the isolation of the major active principle, tetrahydroamentoflavone (THA), a biflavonoid. The in vitro cyclooxygenase (COX-1) catalyzed prostaglandin biosynthesis assay of THA gave an IC₅₀ value of 29.5 μM (COX-1) and 40.5% inhibition at 100 μg/mL (COX-2).

SA extract inhibited the spontaneous and LPS-induced production of proinflammatory cytokines IL-1β and IL-12p40 but had no effect on TNF-α and IL-6 production, both at the protein and mRNA level. The crude extract also suppressed LPS-induced nuclear translocation of transcription factors NF-κB and AP-1; the inhibition of NF-κB was through the inhibition of IκBα phosphorylation.

Antioxidant Mechanisms

Crude extracts and active metabolites of Semecarpus anacardium have shown potential in reversing dysregulated oxidative stress and neuroinflammation. S. anacardium extract (SAE) and its phytocomponents — such as butein, anacardic acid, and amentoflavone — have been experimentally demonstrated to modulate oxidative stress and neuroinflammation. Collectively, these findings indicate that SAE exerts neuroprotective effects through integrated modulation of oxidative stress, inflammatory signalling, and apoptosis.

The milk extract of Semecarpus anacardium nuts at the dose level of 150 mg/kg body weight for 14 days, studied in adjuvant arthritis, showed that increased lipid peroxides levels in both plasma and tissues (liver, kidney, and heart) were significantly decreased by administration of the drug. Administration of Semecarpus anacardium nut extract brings back the altered antioxidant defence components to near normal levels.

Anticancer Mechanisms

GC/MS, IR, proton NMR, carbon NMR, and collisionally induced dissociation (CID) spectra analysis showed that the isolated active anticancer compound is 3-(8′(Z),11′(Z)-pentadecadienyl) catechol (SA-3C). SA-3C is cytotoxic to tumor cell lines with IC₅₀ values lower than doxorubicin, and even multidrug-resistant tumor cell lines were equally sensitive to SA-3C.

The nut milk extract is effective in restoring the fragility of lysosomal membranes in aflatoxin-induced hepatocellular carcinoma.

Shodhana (Purification) and Chemical Transformation

In Ayurveda, a series of pharmaceutical procedures which convert a poisonous drug into a safe and therapeutically effective medicine are termed Shodhana. Shodhana improves the yield, decreases the phenolic and flavonoid content, and converts toxic urushiol into a nontoxic anacardol derivative, thereby reducing the toxicity of the nuts of Semecarpus anacardium.

The concept of Shodhana in Ayurveda comprises both the process of purification/detoxification of physical as well as chemical impurities, and the minimization of undesirable effects, hence improving the therapeutic efficacy of the drugs. Results confirmed that purification imparted chemical changes to certain compounds and enhanced anticancer activity when compared to the raw sample.

5. Scientific Evidence by Area of Use

5.1 Inflammation and Rheumatoid Arthritis

This is the most-studied application, with a body of preclinical (animal) work and limited human-relevant cell-based evidence.

Animal studies: A chloroform extract of the nut significantly reduced acute carrageenan-induced paw oedema in rats and was active against the secondary lesions of adjuvant-induced arthritis. Delayed hypersensitivity induced in mice by sheep red blood cells as an antigen was potentiated by the extract.

The effect of Semecarpus anacardium Linn. nut milk extract on the metabolism of bone turnover was studied by analyzing various markers of bone turnover and by histological and radiological analysis of the joints in adjuvant arthritis in rats. Arthritis was induced by injecting Freund's complete adjuvant. After 14 days of induction, SA (150 mg/kg body weight/day) was administered orally by gastric intubations for 14 days. SA significantly reverted the alterations in bone turnover observed in arthritic animals by modulating the levels of calcium, phosphorus, and the activities of the enzymes tartrate resistant acid phosphatase, acid phosphatase, and alkaline phosphatase.

At a dosage of 150 mg/kg body weight/day for 14 days in adjuvant arthritis, the decreased phagocytic function of neutrophils found in adjuvant arthritis was significantly increased by administration of the drug. Increased levels of reactive oxygen species, lysosomal enzymes, and increased accumulation of neutrophils in the joints observed in arthritic animals were reverted back to near normal levels by treatment with SA.

Human/cell-based evidence: In one study, crude ethanolic extract of SA nuts was evaluated for its anti-inflammatory activities in vitro using peripheral blood and synovial fluid mononuclear cells of healthy individuals and rheumatoid arthritis (RA) patients. SA extract inhibited the spontaneous and LPS-induced production of proinflammatory cytokines IL-1β and IL-12p40 but had no effect on TNF-α and IL-6 production. The study population included 10 healthy adults (age 24–55 years) and 10 rheumatoid arthritis patients (aged between 32 and 60 years) in whom the diagnosis fulfilled the revised ACR criteria. This represents human cell-based, not full clinical trial, evidence.

Clinical trial evidence: An investigator-blind, multicentre, parallel efficacy, three-arm drug trial was conducted on 121 patients for 24 weeks with active moderately severe RA (ACR 1988 classified), using a polyherb formulation (combining Zingiber officinale and Tinospora cordifolia) and a monoherb formulation (Semecarpus anacardium), compared to hydroxychloroquine sulfate (HCQS). Study measures included pain VAS, joint counts, health assessment questionnaire, and global disease assessments. In the polyherb, monoherb, and HCQS arms, 44%, 36%, and 51%, respectively, improved ACR 20 index. This single multi-arm trial found SA monoherb numerically inferior to HCQS in achieving the ACR 20 threshold. Evidence at the clinical level is thus limited to this single study; further controlled trials are needed.

5.2 Anticancer Activity

Evidence characterization: Preliminary — in vitro and animal models only; no human clinical trials identified.

A comprehensive review aimed to examine the pharmacological mechanisms underlying the effects of extracts and phytochemicals of SCA fruits in cellular, animal models, and clinical trials of cancer and inflammatory diseases. A comprehensive literature search was conducted utilizing PubMed, Scopus, Google Scholar, and the Cochrane Database of Systematic Reviews. Of the records focused on anticancer and anti-inflammatory properties, the four primary cancer types linked to SCA fruits were identified as lung cancer, hepatocellular carcinoma, breast cancer, and blood cancer.

Several studies have reported that Semecarpus anacardium Linn. contains compounds, such as anacardic acid, with anti-inflammatory, antioxidant, and anticancer properties. The nut oil from Semecarpus anacardium was shown to be cytotoxic to human leukaemic cell lines.

The ethyl acetate leaf extract selectively affected cancer cells in a dose-dependent manner (IC₅₀: 0.57 µg/mL in MCF-7 breast cancer cells) in various cancer cell lines and induced apoptosis in cancer cells. However, the non-malignant cells were relatively insensitive to the extract.

Further research is needed to understand the full range of therapeutic uses and potential side effects of the plant. While some scientific studies have investigated its potential therapeutic effects, further research is necessary to validate its efficacy and safety. Due to the heterogeneity of the studies reviewed, no meta-analysis has been conducted. All cancer-related evidence remains at the preclinical stage.

5.3 Antioxidant and Cardioprotective Activity

Evidence characterization: Preclinical (animal and in vitro); no clinical trial data identified.

Kalpaamruthaa (comprising an equal ratio of Semecarpus anacardium Linn., Emblica officinalis, and honey) improves the actions of enzymatic antioxidants as well as non-enzymatic antioxidant levels in the pancreas of cardiovascular disorder (CVD)-induced rats.

The fruit and nut extract shows various activities including antiatherogenic, anti-inflammatory, antioxidant, antimicrobial, anti-reproductive, CNS stimulant, hypoglycemic, anticarcinogenic, and hair growth promoter effects. The antiatherogenic activity has been investigated in animal models but has not been validated in human clinical trials.

5.4 Hypoglycemic / Antidiabetic Activity

Evidence characterization: Preclinical (rodent models); no human clinical trial data identified.

A study investigated the antidiabetic and antioxidant activity of Semecarpus anacardium (Linn.) using alloxan-induced diabetic rats. The effect of extract on blood glucose level in groups SA 100, SA 200, and SA 400 was dose-dependent throughout the treatment period. No significant changes in organ weight to body weight ratio were observed; liver weights significantly improved in groups SA 200 and SA 400. The bark extract exhibited significant (p < 0.05) anti-diabetic activity with lowering of TC, TG, and LDL levels dose-dependently and protected the liver, partially explained by attenuation of SGOT and SGPT levels, and increased liver glycogen. These results indicated that stem barks of S. anacardium possess strong anti-diabetic and antioxidant potentials and support traditional medicinal use for the treatment of diabetes mellitus.

5.5 Neuroprotective Activity

Evidence characterization: Primarily in vitro and animal models; a 2025 review notes emerging but still pre-human evidence.

Neurodegenerative diseases (NDs) pose a significant global health burden, and restorative treatments remain elusive. In these conditions, the brain is vulnerable to oxidative stress and inflammation due to a deficiency or reduction in antioxidative enzymes. Oxidative stress and inflammation damage neuronal cells, leading to neurodegeneration. Various studies have explored the neuroprotective effects of flavonoids in different in vitro and animal models. Crude extracts and active metabolites of Semecarpus anacardium have shown potential in reversing dysregulated oxidative stress and neuroinflammation.

Recent studies have explored its various properties such as antioxidant, antimicrobial, hypoglycemic, anti-inflammatory, anticancerous, antiatherogenic, CNS stimulant, skin disease treatment, and hair growth promotion. Evidence in the neuroprotective area is early-stage, with no registered or completed human trials identified in the literature.

5.6 Antimicrobial Activity

Evidence characterization: In vitro laboratory studies only.

The alcoholic extract of dry nuts had anti-fungal activity, while the extract of nut shells was shown to prevent lipid peroxidation. Semecarpus anacardium nut extract has demonstrated antimicrobial activity and is capable of preserving freshly flayed skins for over 30 days. No human clinical data exist specifically for antimicrobial applications.

5.7 Hair Growth Promotion

Evidence characterization: Reported in review literature, mechanistic basis suggested; dedicated clinical trials not identified.

The nuts have been described in Ayurveda and the Siddha system of medicine to treat clinical ailments such as vitiligo, inflammation, microbial infection, geriatric problem, baldness, and neuro-related problems. Different parts including nuts have various medicinal properties to treat diseases like vitiligo, geriatric problems, baldness, and neuro-related problems. The hair growth activity is documented in review literature, attributed to the phenolic and flavonoid content, but specific controlled studies in humans are not reported in the reviewed sources.

6. Body Systems and Health Areas Associated with Semecarpus anacardium

Musculoskeletal System: Seeds are primarily employed to address inflammatory diseases and rheumatoid arthritis.
Dermatological System: Seeds, when processed, are used in Ayurvedic formulations to treat conditions like psoriasis and eczema.
Digestive System: In the Charaka Samhita, S. anacardium is classified as a promoter of digestion and corrective of excessive urination.
Oncology (preclinical): The four primary cancer types linked to SCA fruits through preclinical investigation are lung cancer, hepatocellular carcinoma, breast cancer, and blood cancer.
Nervous System: The plant is reported to possess neuroprotective activity and is used in traditional Ayurvedic context for nervous debility.
Endocrine / Metabolic System: The bark extract has demonstrated anti-diabetic activity with dose-dependent lowering of TC, TG, and LDL levels in preclinical studies.
Cardiovascular System: This toxic plant is reported to possess cardioprotective and hypolipidemic activity in preclinical models.
Liver (Hepatic System): The nut milk extract is effective in restoring the fragility of lysosomal membranes in aflatoxin-induced hepatocellular carcinoma in animal models.
Hair and Scalp: Traditionally used for baldness and hair growth, attributed to its phenolic constituents, based on ethnomedicinal records.

7. Dosage Forms and Reported Dosages

Traditionally, Ayurvedic practitioners use the kernel (nut) and sometimes the root bark. The primary modern extract form used in research is the milk extract (ksheerapaka), in which the nut is processed with milk to reduce toxicity prior to preparation of the medicinal form.

Dosages Reported in Published Studies

Milk extract (nut), animal studies — 150 mg/kg body weight/day for 14 days: The milk extract of Semecarpus anacardium nuts at the dose level of 150 mg/kg body weight for 14 days on adjuvant arthritis was studied for insight into lipid peroxidation and the antioxidant defence system. This dose was used consistently across several studies by Sachdanandam and colleagues in rat adjuvant arthritis models.
Bark extract, animal studies — 100, 200, and 400 mg/kg doses: The survival rate was 100% in rats at Group SA 400. The effect of extract on blood glucose level in Groups SA 100, SA 200, and SA 400 was dose-dependent throughout the treatment period.
Leaf ethyl acetate extract, in vitro: The ethyl acetate leaf extract selectively affected cancer cells in a dose-dependent manner (IC₅₀: 0.57 µg/mL in MCF-7 cells).
COX inhibition, in vitro: The in vitro cyclooxygenase (COX-1) catalyzed prostaglandin biosynthesis assay of tetrahydroamentoflavone (THA) gave an IC₅₀ value of 29.5 μM (COX-1) and 40.5% inhibition at 100 μg/mL (COX-2).
DPPH antioxidant, in vitro (bark extract): In DPPH scavenging assay, the IC₅₀ values of SA extract and ascorbic acid were found to be 72.24 μg/mL and 17.81 μg/mL, respectively.

The commonly used traditional formulations are Amritbhallatak Avaleha, Bhallatakasav, Suran vatak, Bhallatak Parpati, Sanjeevani Vati, and Narsimha choorna. Before using Bhallatak for medical purposes, it is subjected to the process of Shodhana (purification and detoxification). No standardised, validated oral human doses have been established through controlled clinical trials.

8. Safety Considerations and Toxicology

Intrinsic Toxicity of Raw Plant Material

Bhallataka (Semecarpus anacardium) is mentioned under the Upavisha group in Ayurvedic classics and is described as a poisonous medicinal plant in the Drugs and Cosmetics Act (India), 1940. Bhilawanol and anacardic acids are the phytoconstituents responsible for the irritation, blisters, toxicity, and contact dermatitis.

Contact Dermatitis (Urushiol Sensitization)

Bhilawanol A and B are known as urushiols, and anacardic acid is closely related to urushiol. Urushiol-induced contact dermatitis is the medical name given to allergic rashes produced by the oil urushiol. Cases of contact dermatitis have been reported during different stages of Shodhana (purificatory measures) of Bhallataka fruit due to improper handling of utensils and disposal of media used in the Shodhana procedure.

This plant possesses toxic characteristics capable of causing skin and ocular lesions, miscarriages, and dermatitis. Exposure to the plant's sap can lead to nephrotoxicity and painful micturition.

Requirement for Purification (Shodhana)

In Ayurveda, it is clearly mentioned that the drug Bhallataka should be used after Shodhana (purification/processing). Shodhana plays an important role in reducing adverse effects during internal administration. Bhallataka should be collected and processed with due consideration of precautionary methods mentioned in Ayurvedic classics.

The Shodhana procedure of Bhallataka includes soaking the fruits in Gomutra (cow's urine), Godugdha (cow's milk) and rubbing on brick gravels. After removing the thalamus portions, the fruits are kept either in Gomutra (for 7 days) or Godugdha (for 7 days), and are finally washed with water.

The Shodhana process led to the SA after purification showing lesser oil content as compared to raw drugs. The fruit of Bhallathaka in raw form has been reported to cause irritation, blisters, toxicity, and contact dermatitis, and hence it should be used for medicine preparation only after the specific purification process known as Shodhana in Ayurveda.

Gastrointestinal and Systemic Toxicity

The juice of this herb can cause irritation, painful blisters, and itchiness of neighboring skin. The herb should not be taken in large doses, as it can produce blisters on the throat and even cause severe gastrointestinal irritation, and sometimes even hypotension, dyspnoea, and areflexia.

Drug Classification and Regulatory Status

Bhallataka is mentioned under the Upavisha group in Ayurvedic classics and is described as a poisonous medicinal plant in the Drugs and Cosmetics Act (India), 1940. There is no documented approval by Western regulatory agencies (FDA, EMA, EFSA) for Semecarpus anacardium as a dietary supplement or drug, and no WHO monograph or Pharmacopeial standard has been published specifically for this plant according to sources reviewed.

Milk Co-Administration

Semecarpus anacardium (Bhallataka) is traditionally given with milk in Ayurveda. When toxicity studies were carried out in animals there was mortality, which was nullified when the plant was co-administered with milk. The Ayurvedic dietary practice of consuming milk, rice, and ghee alongside Bhallataka preparations is consistently recommended in classical texts to buffer against the plant's toxicity.

9. Evidence Summary and Research Gaps

Semecarpus anacardium has accumulated a substantial body of preclinical literature. Several trials have investigated its anti-atherogenic, anti-inflammatory, antioxidant, antimicrobial, anti-reproductive, CNS stimulant, hypoglycemic, anticarcinogenic, and hair growth-promoting activities. However, the evidence base for most of these applications consists predominantly of in vitro cell studies and animal models, with the single notable clinical exception being the rheumatoid arthritis trial described above.

Further research is needed to understand the full range of therapeutic uses and potential side effects of the plant. More efforts are needed to study the traditional uses of the plant and the subsequent validation of activity. The chemical heterogeneity between raw and purified samples, differences in extraction method, and lack of standardised active-fraction dosing represent significant barriers to clinical translation. No Cochrane systematic review or major government health body analysis (NIH ODS, EMA, EFSA) specifically addressing Semecarpus anacardium as a dietary supplement was identified in the reviewed sources, reflecting the early stage of its evidence development in the context of evidence-based medicine.

References

Health Conditions

Health conditions that Marking nut tree may help support.

No conditions available.

Body Systems

Body systems that Marking nut tree may help support.

No body systems available.