Sweet flag

Sweet Flag (Acorus calamus L.): A Comprehensive Reference

1. Identity, Botanical Classification, and Natural Source

Acorus calamus, commonly known as sweet flag, belongs to the rhizomatous family Acoraceae. It is a tall wetland monocot in the genus Acorus, known by many common names including sweet flag, sway, and muskrat root, and is a species of flowering plant containing psychoactive chemicals. The genus name is derived from classical sources: the generic name is the Latin word acorus, derived from the Greek áchórou of Dioscorides, which itself is thought to have come from the word kóri (meaning "pupil of an eye"), because the juice from the root was used as a remedy in diseases of the eye.

In addition to "sweet flag" and "calamus," other common names include beewort, bitter pepper root, calamus root, flag root, gladdon, myrtle flag, myrtle grass, myrtle root, myrtle sedge, pine root, sea sedge, sweet cane, sweet cinnamon, sweet grass, sweet myrtle, sweet root, sweet rush, and sweet sedge. In Sanskrit, the plant is known as Vacha (meaning "speech"), and in Hindi as Bach. In Traditional Chinese Medicine it is referred to as Shi Chang Pu.

This perennial herb is common on the banks of streams and in damp marshy places. Sweet flag is a herbaceous perennial reaching up to 2 m in height, with leaves resembling those of the iris family; it consists of tufts of basal leaves rising from a spreading rhizome. Acorus calamus is a semi-aquatic component of aquatic habitats throughout the temperate to sub-temperate regions of Eurasia and the Americas, and is thought to be indigenous to India, subsequently spread along trade routes.

Cytotypes and Geographical Variation

A critical aspect of Acorus calamus identity is its existence in multiple cytotypes (ploidy levels) that differ profoundly in their chemistry and safety profiles. From a karyotypic point of view, sweetflag includes four cytotypes: diploid (2× = 24), triploid (2× = 36), tetraploid (4× = 48), and hexaploid (6× = 72).

• Diploid (2×): Diploids do not produce the carcinogenic β-asarone and are known to grow naturally in Eastern Asia (Mongolia and central Siberia) and North America.
• Triploid (3×): European and North American triploid cytotypes contain 3–19% β-asarone.
• Tetraploid (4×): Indian, Indonesian, and Taiwanese tetraploid cytotypes contain up to 96% β-asarone.
• Triploid origin: The triploid cytotype probably originated in the Himalayan region, as a hybrid between the diploid and tetraploid cytotypes.

Alcoholic extracts of the triploid A. calamus are characterized by a higher percentage of β-asarone (11%) as the main compound, along with camphene, E-β-ocimene, camphor, calarene, α-selinene, and τ-cadinol. The diploid had higher percentages of iso-shyobunone, β-sesquiphellandrene, preisocalamendiol, and acorone, and completely lacked β-asarone.

Common Forms and Preparations

The primary medicinal part of the plant is its rhizome. Acorus calamus commercially occurs in both peeled and unpeeled forms. Rhizomes and leaves are profusely practiced in the form of infusion, powder, paste, or decoction. The rhizomes have been used in various forms such as powder, paste, decoction, and medicated ghee, to address issues like diarrhea, epilepsy, skin diseases, headache, and indigestion. Sweet flag has also been valued for its rhizome and fragrant oils, which have been used medicinally, in alcoholic beverages, as a fragrant essence in perfumes and oils, and for insecticidal properties. The essence from the rhizome is used as a flavor for foods, alcoholic beverages, and bitters in Europe. An essential oil is also distilled from the rhizome for use in medicine and perfumery.

2. Traditional and Historical Use

Ancient and Cross-Cultural History

The plant has a rich ethnobotanical history dating possibly back to the time of Moses in the Old Testament of the Bible and in early Greek and Roman medicine. It was traded by the Mesopotamian culture over 3,000 years ago. Since ancient times, it has been used in various systems of medicine such as Ayurveda, Unani, Siddha, and Chinese medicine for the treatment of various ailments including nervous disorders, appetite loss, bronchitis, chest pain, colic, cramps, diarrhea, digestive disorders, flatulence, gas, indigestion, rheumatism, cough, fever, inflammation, depression, tumors, hemorrhoids, skin diseases, numbness, general debility, and vascular disorders.

Ayurvedic Tradition (India)

Acorus calamus is front and center in Ayurvedic classics like the Charaka Samhita and Ashtanga Hridaya, primarily under the Sanskrit name Vacha, meaning "speech." In Ayurveda, it is classified as a Medhya Rasayana — a category of herbs said to promote intellect and memory. In Ayurveda, Acorus calamus is considered a vital herb, known for its role as a "rejuvenator" for the brain and nervous system, and as a remedy for digestive disorders. It was used for speech impediments in children, epilepsy, and as a nootropic agent. Vacha (Acorus calamus Linn., Acoraceae) is a traditional Indian medicinal herb practiced to treat a wide range of health ailments, including neurological, gastrointestinal, respiratory, metabolic, kidney, and liver disorders.

Traditional Chinese Medicine

Sweet flag has a long history of use in Chinese, Nepalese, and Indian herbal traditions. In TCM, preparations of A. calamus (known as Chang Pu or Shi Chang Pu) were used as tonics and to treat phlegm-related conditions. It has been utilized in traditional medicine for conditions such as phlegm syncope, stroke, epilepsy, palpitation, amnesia, tinnitus, deafness, and pediatric febrile convulsions, and used as sedative, anti-diarrheic, carminative, tonic, and stimulant. In China, preparations made from Acorus calamus are employed as tonics, antipyretics, and antidiarrheal agents.

North American Indigenous Use

Sweet flag was and is used in herbalism by the Chipewyan people. The Cree people of northern Canada, among others, chewed calamus rhizome as an energy-boosting stimulant on long hunting trips.

European Herbal Tradition

A. calamus has been an item of trade in many cultures for centuries, used in traditional medicine for various ailments, while the aroma of its essential oil has been used in the perfume industry; the essence from the rhizome was used as a flavor for foods, alcoholic beverages, and bitters in Europe. It was also once used to make candy; the young stalks can be pulled when under 30 cm, with inner stems eaten raw; roots could be washed, peeled, cut into pieces, boiled, and simmered in syrup to make candy.

3. Key Constituents and Active Compounds

Overview of Phytochemistry

To date, 145 constituents have been isolated from this herb and identified, including phenylpropanoids, sesquiterpenoids, and monoterpenes. Different parts of the plant showed the presence of a large number of phenylpropanoids, sesquiterpenes, and monoterpenes, as well as xanthone glycosides, flavones, lignans, steroids, and inorganic constituents.

Asarones — The Primary Bioactive Phenylpropanoids

A number of active constituents from leaves, rhizomes, and essential oils of A. calamus have been isolated and characterized; of these, alpha- and beta-asarone are the predominant bioactive components. The chief constituents found in the volatile oil are 2,4,5-trimethoxy-1-propenylbenzene as β-asarone and α-asarone, chemically classified as trans- and cis-isomers, respectively.

These secondary plant metabolites belong to the class of phenylpropenes (phenylpropanoids or alkenylbenzenes), further chemically classified into the propenylic trans- and cis-isomers α-asarone and β-asarone, and the allylic γ-asarone. The relative content of these isomers is strongly dependent on cytotype and geography, as described above.

Sesquiterpenes

The sweet flag oil present in this plant is a unique source of oxygenated sesquiterpenes of great structural variety. Key sesquiterpenes include acorenone, isocalamendiol, calarene, α-selinene, and τ-cadinol. Beta-asarone is the major constituent in the leaves (27.4–45.5%), whereas acorenone is dominant in the rhizomes (20.86%), followed by isocalamendiol (12.75%).

Monoterpenes

Some of the monoterpenes reported in A. calamus include α- and β-pinenes, myrcene, para-cymene, α-terpinene, β-phellandrene, γ-terpinene, terpinolene, thujane, and limonene. Other constituents identified include camphor, eugenol, methyl isoeugenol, borneol, spathulenol, and caryophyllene.

Other Compound Classes

It is known to contain several bioactive compounds, chiefly phenylpropanoids (asarone and eugenol) and sesquiterpenoids, which contribute to its diverse pharmacological effects. Additional compound classes include flavonoids, xanthones, lignans, tannins, and various steroids.

4. Mechanisms of Action

Neuropharmacological Mechanisms

β-Asarone can easily pass through the blood-brain barrier, and substantial experimental evidence indicates that β-asarone is the active ingredient for attenuating learning and memory deficits. Multiple preclinical mechanisms have been identified:

• β-Asarone, a major component of the essential oil, displayed antioxidation effects by decreasing levels of MDA and HIF and increasing levels of SOD, CAT, and GSH-Px; exerted antiapoptotic activity through regulating the CaMKII/CREB/Bcl-2 signaling pathway; inhibited synaptic loss through reducing ROCK expression; and mediated synaptogenesis via Arc/Arg3.1 and Wnt pathway.
• α-Asarone exerted antioxidation effects by increasing CAT, SOD, and GSH-Px; displayed anti-inflammatory activity through reducing the expression of proinflammatory mediators; improved circulation via decreasing the activity of AChE (acetylcholinesterase); and exerted antineurotoxicity by decreasing Aβ plaque depositions.
• Asarones in A. calamus have been documented to inhibit acetylcholinesterase (AChE), an enzyme that degrades the neurotransmitter acetylcholine — a mechanism shared with several established cognitive-enhancement drugs.

Anti-inflammatory and Antioxidant Mechanisms

The A. calamus DMSO extract exhibited significant anti-inflammatory properties in bovine serum albumin (BSA) and egg albumin (EA) denaturation assays, similar to the standard diclofenac sodium. In DPPH and H₂O₂ tests, the DMSO extract of A. calamus showed significant antioxidant activity, near that of standard ascorbic acid.

Broader Pharmacological Activities

Pharmacological studies have revealed that Acorus rhizome and its constituents, particularly α- and β-asarone, possess a wide range of pharmacological activities such as sedative, CNS depressant, behavior modifying, anticonvulsant, acetylcholinesterase inhibitory, memory enhancing, anti-inflammatory, antioxidant, antispasmodic, cardiovascular, hypolipidemic, immunosuppressive, cytoprotective, antidiarrheal, antimicrobial, anthelmintic, insecticidal, diuretic, genotoxic, and mutagenic activities.

5. Scientific Evidence by Area of Use

It is important to note at the outset that the large majority of evidence for sweet flag is preclinical — derived from animal models and in vitro studies. Human clinical evidence is sparse, and most clinical reports come from Ayurvedic practice literature with limited methodological rigor.

5.1 Neurological and Cognitive Function

Traditional use context: In Ayurveda, A. calamus is classified as a Medhya Rasayana (nootropic tonic) and has been used for centuries to enhance memory, speech, and intellectual function.

Preclinical evidence: β-Asarone has been shown in animal studies to alleviate cognitive impairments in Parkinson's disease, Alzheimer's disease, and neuroinflammatory conditions. A rodent study published in PMC examined A. calamus on lipopolysaccharide-induced neuroinflammation; researchers assessed the effect of Acorus calamus on memory loss, anxiety, and antioxidant indices in neuroinflammation rat models using different fractions of A. calamus, with animals grouped in 11 groups of 10 each; the extract gavage began 1 week before LPS injection and continued for 2 weeks after the last injection; behavioral tests including passive avoidance and elevated plus-maze tests were run on days 24, 25, and 26.

Clinical evidence: Clinical efficacy has been reported in a study of a combined Guduchyadi Medhya Rasayana formulation on senile memory impairment. A clinical study on the management of generalized anxiety disorder with Vaca (Acorus calamus) was published in the Indian Journal of Traditional Knowledge. However, these are small, largely uncontrolled studies from Ayurvedic settings. Limited clinical trials have been conducted on calamus; those that do exist have primarily focused on its antispasmodic and cognitive benefits, and the results are inconclusive, with much of the evidence supporting its use remaining anecdotal.

Evidence strength: Predominantly preclinical (animal/in vitro). Human clinical data is preliminary, limited in scale, and lacks rigorous controls. No large randomized controlled trials exist.

5.2 Anticonvulsant Activity

Traditional use context: Rhizomes were used in the care of epilepsy seizures in Indian communities, with powder of rhizome, decoction, and paste of rhizome used depending on the region.

Preclinical evidence: It is reported to possess insecticidal, larvicidal, antibacterial, mutagenic, cytotoxic, hepatoprotective, anticonvulsant, neuroleptic, smooth muscle relaxant, and smooth muscle stimulant activity — largely from animal experiments. Studies have examined ferric chloride-induced epileptogenesis models in rats, where inhibitory effects of A. calamus were observed.

Evidence strength: Animal studies only. No controlled clinical evidence currently supports use for epilepsy.

5.3 Gastrointestinal Health

Traditional use context: Sweet flag is commonly used in traditional medicinal systems of Asian and European countries to treat appetite loss, diarrhea, digestive disorders, bronchitis, indigestion, and chest pain.

Preclinical evidence: Various pharmacological activities of A. calamus rhizome such as sedative, CNS depressant, anticonvulsant, antispasmodic, cardiovascular, hypolipidemic, immunosuppressive, anti-inflammatory, cryoprotective, antioxidant, antidiarrheal, antimicrobial, anticancer, and antidiabetic have been reported. The plant's antispasmodic actions on smooth muscle and its carminative properties have been demonstrated in animal gut preparations.

Evidence strength: Traditional use is historically robust. Preclinical evidence of antispasmodic and antidiarrheal activity exists. No rigorous clinical trials specifically evaluating gastrointestinal endpoints are available in the peer-reviewed literature.

5.4 Anti-inflammatory and Analgesic Effects

A 2011 animal study published in BMC Complementary and Alternative Medicine investigated the attenuating role of Acorus calamus plant extract in chronic constriction injury of sciatic nerve-induced peripheral neuropathy in rats. Hydroalcoholic extract of Acorus calamus (HAE-AC, 100 and 200 mg/kg, p.o.) and pregabalin (10 mg/kg, p.o.) were administered from the day of surgery for 14 days. The study provided preclinical evidence of anti-oxidative, anti-inflammatory, neuroprotective, and calcium inhibitory effects.

Evidence strength: Preclinical (animal) only. Results are promising but not translatable to clinical recommendations without further human studies.

5.5 Antimicrobial Activity

The essential oil of A. calamus and its major compound β-asarone were tested against five Gram-positive, eight Gram-negative bacteria, and three fungi by the tube-dilution method; forty constituents were identified, which comprised 98.3% of the total oil. The DMSO extract of A. calamus exhibited a significant inhibition zone against the pathogens Streptococcus mutans and Pseudomonas aeruginosa during antimicrobial evaluation, surpassing the efficacy of the standard antibiotic in this in vitro study.

One study noted that specific bioactive compounds were not identified, which is necessary for understanding mechanisms; additionally, the study heavily relied on in vitro experiments, which need to be validated in in vivo settings to thoroughly assess safety and efficacy.

Evidence strength: In vitro only. Promising antimicrobial results have not been replicated in clinical settings.

5.6 Antidepressant and Anxiolytic Effects

Compelling evidence is suggestive of the biopotential of its various extracts and active constituents in several metabolic and neurological disorders, including anticonvulsant, antidepressant, antihypertensive, anti-inflammatory, immunomodulatory, neuroprotective, cardioprotective, and anti-obesity effects. A 2023 animal study published in PMC examined the role of Acorus calamus in preventing depression, anxiety, and oxidative stress in long-term socially isolated rats, finding positive effects on behavioral and biochemical markers.

Evidence strength: Preclinical (animal). A small clinical study on generalized anxiety disorder with Vacha has been reported in the Ayurvedic literature, but methodology details are limited.

5.7 Cardiovascular and Metabolic Effects

A controlled clinical trial of the lekhaniya drug Vaca (Acorus calamus) in cases of ischemic heart disease has been reported in the Journal of Research in Ayurveda and Siddha. A clinical study of anti-hyperlipidemic activity of Vacha (Acorus calamus) was also published in an Ayurvedic medicine journal. These Ayurvedic clinical reports indicate interest in cardiovascular applications, but the studies are small and not yet confirmed by high-quality controlled trials.

Evidence strength: Limited and preliminary. Some Ayurvedic clinical reports exist, but robust randomized controlled trials are absent.

5.8 Insecticidal Properties

Sweet flag has been valued for its rhizome and fragrant oils, and current research investigates its value as an insecticidal, antibacterial, and antifungal agent. This is one of the most empirically documented non-medicinal applications of the plant, with oil constituents demonstrating larvicidal and insecticidal activity in multiple in vitro and semi-field studies.

Evidence strength: In vitro and semi-field studies. Well-documented historically, with supporting laboratory evidence. Not a clinically relevant endpoint for human use.

6. Body Systems and Health Areas Associated with Sweet Flag

• Central Nervous System: Cognitive enhancement, nootropic effects, anticonvulsant, antidepressant, anxiolytic, sedative, CNS depressant properties
• Gastrointestinal System: Carminative, antispasmodic, antidiarrheal, appetite-stimulating, digestive tonic
• Respiratory System: Acorus calamus is used in disorders caused by phlegm, including those related to the respiratory system such as asthma and upper and lower respiratory infections.
• Cardiovascular System: Antihypertensive, hypolipidemic, cardioprotective (preclinical)
• Metabolic System: Anti-obesity, antidiabetic, anti-hyperlipidemic (largely preclinical/traditional)
• Musculoskeletal and Inflammatory: Anti-inflammatory, analgesic, anti-rheumatic
• Dermatological: The leaves and rhizomes are used traditionally for the treatment of eczema and sinusitis.
• Antimicrobial: Antibacterial, antifungal (in vitro evidence)

7. Dosage Forms and Reported Dosages

The following dosage information is drawn from traditional Ayurvedic practice descriptions, clinical study protocols, and herbal medicine references — not from authoritative regulatory monographs, as no such regulatory-approved dosage range exists for sweet flag in Western contexts.

• Powdered rhizome (Vacha Churna): Traditionally, the powdered rhizome is administered in doses ranging from 125 mg to 500 mg, once or twice daily.
• Neuropathic pain animal study: Hydroalcoholic extract of Acorus calamus at 100 and 200 mg/kg (p.o.) and pregabalin at 10 mg/kg (p.o.) were administered from the day of surgery for 14 days. (This is an animal dosage, not a human dose.)
• Traditional maximum dose (herbal medicine reference): In herbal medicine, the maximum dose that is generally recommended is 4 g of the dried root (about ¾ of a teaspoon), 30 ml of a decoction, and 4 ml of 1:5 tincture, up to three times a day.
• Epilepsy — ethnobotanical regional use: In one region of India (Uttarakhand), it is mixed with Selinum vaginatum and Paeonia emodi powder and given at the rate of half a teaspoon twice a day.
• Rhizome preparations: Rhizomes and leaves are practiced in the form of infusion, powder, paste, or decoction.

Genotoxicity and mutagenicity of beta- and alpha-asarone are reported, which limits their use at high dosage. Though A. calamus has been used since ancient times, many of its uses are yet to be scientifically validated.

8. Safety, Toxicology, and Regulatory Status

β-Asarone: Carcinogenic and Genotoxic Potential

α-Asarone and β-asarone are reported to be genotoxic and hepatocarcinogenic in rodents. There are also reports of their mammalian toxicity and carcinogenicity. It is reported that β-asarone is more toxic than α-asarone.

β-Asarone has been demonstrated to be responsible for carcinogenic effects involving duodenal tumor induction, unscheduled DNA synthesis in hepatocytes, as well as antiproliferative and immunosuppressive, central nervous system inhibitory, sedative, and hypothermic effects.

Cytotoxic and genotoxic effects of asarones against HepG2 cells are also reported. After metabolic activation, β-asarone at concentrations higher than 50 μg/mL was genotoxic as indicated by positive Ames test and sister chromatid exchange test.

Documented Human Adverse Effects

In human studies, exposure to asarones from the herb Acorus calamus, which contains high concentrations of asarones, caused prolonged vomiting in 7 consumers.

Regulatory Bans and Restrictions

In the US, use of calamus and its products was banned in 1968 following demonstration of carcinogenic effects of long-term, high-dosage application in an animal model; an essential oil component, β-asarone, was identified as the responsible procarcinogenic agent. Calamus has been banned by the FDA as a food additive, and within the last few years many herbal shops have stopped recommending or dispensing it.

Annex II of Directive 88/388/EEC on flavorings fixed the maximum levels of β-asarone to 0.1 mg/kg in foodstuffs and beverages, with the exception of 1 mg/kg in alcoholic beverages and seasonings used in snack foods.

Based on estimated daily exposure and reported adverse effects, officials restricted or published recommendations for the use of β-asarone and preparations of Acorus calamus. Efficacy and safety in humans are still not known. Preclinical evidence has not been systematically studied, and several pharmacological effects have been reported for extracts of Acorus calamus and propenylic asarone isomers. Toxicological data are rare and not critically evaluated altogether in the 21st century yet.

Overall Toxicological Profile

The toxicological profile of A. calamus is heterogeneous and chemotype-dependent, and its toxicological profile remains insufficiently studied. A publication reviewing the overall toxicity profile of the extract of A. calamus has demonstrated cardiotoxic, hepatotoxic, reproductive toxic, mutagenic, and carcinogenic potential for propenyl asarone isomers.

A 2025 in vitro study using OECD-compliant new approach methods (NAMs) found that A. calamus rhizome oil was classified as a GHS Category 1B skin sensitizer and a Category 2 irritant, while demonstrating a non-corrosive profile.

Cytotype-Dependent Safety

A crucial factor in the toxicology of A. calamus is the remarkable variation in β-asarone content across different cytotypes of the plant. The diploid (2×) variety, native to North America and parts of Eastern Asia, is virtually free of β-asarone; the triploid (3×) form, commonly found in Europe, is an infertile hybrid that contains low to moderate levels of β-asarone, typically less than 15% of the essential oil; and the tetraploid (4×) cytotype, predominant in India and other parts of Asia, is characterized by extremely high concentrations of β-asarone, ranging from 70% to as high as 96% of the essential oil.

For reasons of optimal drug safety, the use of asarone-rich races should be avoided. A. calamus ecotypes with low concentrations of β-asarone can be used for medicinal purposes.

Interactions

Given its CNS-depressant properties demonstrated in animal studies, potential for additive effects with other sedatives, anticonvulsants, and CNS-depressant medications is a theoretical concern. The pharmacological activities exhibited by Acorus calamus are mainly due to the presence of α- and/or β-asarone; the preclinical pharmacological and toxicological effects of these compounds have been summarized, but insufficient data exists on their human toxicokinetics. Although used in traditional medicine over centuries to treat digestive disorders and pain, it has no clinical evidence of safety or efficacy and may be toxic if ingested, and so has been commercially banned for use in food in the United States.

9. Summary of Evidence Quality

Though A. calamus has been used since ancient times, many of its uses are yet to be scientifically validated. The plant has an exceptionally long and geographically broad history of traditional use across Ayurveda, TCM, Unani, Siddha, and multiple indigenous traditions worldwide. Laboratory and animal studies have confirmed a wide range of biological activities corresponding to many traditional uses, particularly in the neurological, anti-inflammatory, and antimicrobial domains. However, the translation of these findings to human clinical evidence remains extremely limited. High-quality randomized controlled trials in humans are largely absent. Safety concerns surrounding β-asarone — particularly its carcinogenic and genotoxic profile in animal studies — have led to significant regulatory restrictions in the United States and the European Union. The cytotype of the plant material is the single most critical determinant of both therapeutic potential and safety risk. Diploid varieties (North America, parts of Eastern Asia) present substantially lower β-asarone-related risks compared to the tetraploid varieties dominant in India and tropical Asia.

References

• PubMed: Acorus calamus Linn.: phytoconstituents and bactericidal property (2016)
• PubMed: Acorus calamus: a bio-reserve of medicinal values (2018)
• ScienceDirect: An overview on traditional uses and pharmacological profile of Acorus calamus Linn. (Sweet flag) and other Acorus species (2014)
• PMC / Journal of Clinical Medicine: Role of Vacha (Acorus calamus Linn.) in Neurological and Metabolic Disorders (Sharma et al., 2020)
• PMC: The Effects of Acorus calamus L. in Preventing Memory Loss, Anxiety, and Oxidative Stress on Lipopolysaccharide-induced Neuroinflammation Rat Models
• PMC: β-Asarone Rescues Pb-Induced Impairments of Spatial Memory and Synaptogenesis in Rats
• PMC: Extracts or Active Components from Acorus gramineus Aiton for Cognitive Function Impairment: Preclinical Evidence and Possible Mechanisms (2020)
• PMC: Role of Acorus calamus in Preventing Depression, Anxiety, and Oxidative Stress in Long-Term Socially Isolated Rats (2023)
• PMC / BMC Complementary and Alternative Medicine: Attenuating effect of Acorus calamus extract in chronic constriction injury-induced neuropathic pain in rats (2011)
• PMC: Free Radical Scavenging, Anti-inflammatory and Antibacterial Activity of Acorus calamus Leaves Extract (2024)
• ScienceDirect / Chemico-Biological Interactions: Is it safe to use Acorus calamus as a source of promising bioactive compounds in prevention and treatment of cardiovascular diseases? (2017)
• Journal of Applied Toxicology: α-Asarone, β-asarone, and γ-asarone: Current status of toxicological evaluation (Uebel et al., 2021)
• Frontiers in Pharmacology: Hepatotoxic potential of asarones: in vitro evaluation of hepatotoxicity and quantitative determination in herbal products (2015)
• ScienceDirect / Phytochemistry: Identification of an EcoRI restriction site for a rapid and precise determination of β-asarone-free Acorus calamus cytotypes (Bertea et al., 2005)
• PubMed: Identification of an EcoRI restriction site for a rapid and precise determination of beta-asarone-free Acorus calamus cytotypes (2005)
• MDPI Toxics: Comprehensive In Vitro Safety Assessment of Acorus calamus Rhizome Oil Using OECD-Compliant New Approach Methods (2025)
• PubMed: To the classification of commercial Calamus drugs — β-asarone content and cytotypes
• Springer / Economic Botany: The Ethnobotany of Sweet Flag, Acorus calamus (Araceae) (Motley, 1994)
• Acorus calamus — Wikipedia (for nomenclature and common names)
• ScienceDirect Topics: Acorus calamus — overview
• Taylor & Francis / Pharmaceutical Biology: Acorus calamus: Scientific Validation of Ayurvedic Tradition
• Traditional Medicines: The History of the Oldest Traditional Medicinal Plant Ever Known to Mankind: Sweet Flag (Vacha) Acorus calamus L. (2024)
• PubMed: Role of Acorus calamus and alpha-asarone on hippocampal dependent memory in noise stress exposed rats (2014)
• Washington State University LCME: Calamus research organism profile