Thailand’s Department
of Medical Sciences
Studied This Kitchen Herb
Boesenbergia rotunda — panduratin A, COVID-19 antiviral research, and the herb in your Thai green curry that nobody is reading the pharmacology on
During the COVID-19 pandemic, Thailand’s Department of Medical Sciences identified panduratin A — the primary active compound in Temukunci (Fingerroot) — as having significant activity against SARS-CoV-2 replication in cell culture. The same rhizome that appears in Thai green curry, Malaysian asam pedas, and Indonesian recipes had just entered antiviral research. The compound is also documented against multiple cancer cell lines, functions as a COX-2 inhibitor, inhibits pancreatic lipase, and activates AMPK. The food on your plate was pharmacologically active the whole time.
Panduratin A and SARS-CoV-2
“Panduratin A inhibited SARS-CoV-2 replication in Vero cells with an IC50 of 5.83 μg/mL — comparable to remdesivir activity in the same assay conditions.”
Thailand’s pandemic response included systematic screening of traditional medicinal plants with documented antiviral history. Boesenbergia rotunda — used across Thai, Malaysian, and Indonesian traditional medicine — was included. The primary active compound, panduratin A, demonstrated significant inhibition of SARS-CoV-2 replication in cell culture.
The mechanism identified: panduratin A inhibits the SARS-CoV-2 main protease (3CLpro) — the viral enzyme essential for processing the polyprotein that the virus needs to replicate. This is a known antiviral drug target: nirmatrelvir (Paxlovid) targets the same protease through a different mechanism. The herb and the pharmaceutical drug target the same viral vulnerability through different chemical pathways.
Critical framing: In vitro antiviral activity does not equal a COVID-19 treatment. The research demonstrates pharmacological mechanism in cell culture — not clinical outcome in human trials. This finding warrants continued clinical research. It does not constitute evidence for replacing COVID treatment with Temukunci preparations.
What the Evidence Shows
Panduratin A — a chalcone — demonstrates documented cytotoxicity against prostate cancer, colon cancer, breast cancer, and other cell lines. Anti-cancer research ongoing across multiple institutions.
Like ginger’s shogaols, panduratin A activates AMPK — the body’s master metabolic switch. Metformin’s mechanism. Implications for insulin sensitivity, fat metabolism, and anti-cancer activity.
Pinocembrin — the other primary flavonoid in Temukunci — demonstrates COX-2 inhibitory activity. Anti-inflammatory mechanism documented alongside the antiviral and anti-cancer research.
Panduratin A inhibits pancreatic lipase — the orlistat mechanism. Anti-obesity activity documented from the same compound responsible for antiviral and anti-cancer activity.
Temukunci (Boesenbergia rotunda) and Cekur (Kaempferia galanga) are different genera. EPMC — Cekur’s primary compound — is absent from Temukunci. Panduratin A is absent from Cekur. Not interchangeable.
Thailand (Krachai), Malaysia (Temukunci), Indonesia (Temu Kunci) — all use this rhizome in cooking and medicine simultaneously. The food-pharmacy boundary was never drawn in traditional practice.
Five Things That Reframe Temukunci
Panduratin A targets the same SARS-CoV-2 protease as Paxlovid (nirmatrelvir) — through a completely different chemical mechanism. A kitchen herb and a pharmaceutical antiviral hit the same viral vulnerability.
3CLpro (the main protease) is the viral enzyme that processes the SARS-CoV-2 polyprotein required for replication. Nirmatrelvir covalently inhibits it. Panduratin A inhibits it through non-covalent binding. The target is the same. The mechanism is different. The herb was in Thai green curry before the virus existed. This is why systematic screening of traditional plants with antiviral history was a rational pandemic research strategy.
Panduratin A activates AMPK — the same mechanism as metformin, the world’s most prescribed diabetes drug. The anti-cancer and anti-obesity effects of Temukunci converge on the same master metabolic switch.
AMPK activation: improves insulin sensitivity, promotes fat oxidation, suppresses cancer cell energy metabolism, inhibits mTOR signalling. This single mechanism connects Temukunci’s anti-obesity (lipase inhibition + AMPK), anti-cancer (AMPK-mediated mTOR suppression), and metabolic health applications. It also explains why traditional classifications of this plant for digestive, weight, and energy conditions were observing a coherent biological reality.
Temukunci and Cekur are two completely different plants that have been confused across Southeast Asian markets for decades. The confusion means people are buying one plant expecting the pharmacology of the other.
Cekur = Kaempferia galanga. Primary compound: EPMC (cinnamate ester). Temukunci = Boesenbergia rotunda. Primary compounds: panduratin A, pinocembrin (flavonoids and chalcones). Different genus, different compound classes, different mechanisms, different applications. The finger-like root shape of Temukunci (hence “Fingerroot” and “Chinese Keys”) is the visual identifier — distinct from Cekur’s flat disc-shaped rhizome.
Panduratin A has documented anti-cancer activity against prostate cancer specifically — through AR (androgen receptor) signalling suppression. Relevant for men managing androgen-sensitive conditions alongside or instead of pharmaceutical interventions.
Multiple studies document panduratin A’s anti-cancer activity against prostate cancer cell lines through suppression of androgen receptor signalling and AMPK-mediated energy depletion of cancer cells. This is not a general “anti-cancer herb” claim — it is a specific documented mechanism in a specific cancer type that has been the subject of focused research. Clinical trials are not yet published at the scale needed for clinical recommendations.
The finger-shaped rhizomes of Temukunci look nothing like regular ginger, turmeric, or Cekur — but Thai and Malaysian market vendors often sell all of them in the same section without clear labelling. Know what you are buying.
Boesenbergia rotunda produces distinctive finger-like rhizomes — multiple thin, elongated lobes projecting from a central body, resembling a hand or a bunch of keys. This is the origin of both “Fingerroot” and “Chinese Keys.” No other common rhizome in Southeast Asian markets looks like this. If it has the finger-shaped roots, you have Temukunci. If it is a flat disc or a rounded nodular rhizome, you do not.
One Rhizome, Four Cultures
“Lock rhizome” or “key rhizome” — the finger-like roots resemble a bunch of keys. Used in Malay traditional medicine for fever, digestive conditions, and respiratory infections. Present in some traditional Malaysian recipes.
Essential in Thai green curry, Thai fish preparations, and herbal medicine. Thai traditional medicine uses it for digestive conditions, fatigue, and respiratory infections. Thailand has the most active current pharmacological research programme on this plant — including the COVID-19 antiviral work.
Used in Jamu preparations for digestive conditions, flatulence, and as a traditional health tonic. The Indonesian Jamu documentation of this plant parallels the Thai medical research — systematic observation of the same applications that the pharmacology now explains.
Both names reference the distinctive finger-like root morphology. “Chinese Keys” is used in European and American markets where the plant is imported for specialty Asian cooking. Less commonly known outside Southeast Asian culinary contexts.
Documented in Ayurvedic and traditional Indian medicine for digestive conditions and respiratory applications. The antifungal properties are documented in Ayurvedic ethnobotanical records — consistent with modern laboratory findings on panduratin A and pinocembrin.
Family Zingiberaceae. Formerly classified as Kaempferia pandurata — the reclassification into Boesenbergia reflects a distinct genus from Kaempferia galanga (Cekur). This taxonomic distinction is why the two plants are not interchangeable pharmacologically. Small plant (30–50cm), native to Southeast Asia.
What Temukunci Contains
Boesenbergia rotunda’s pharmacological profile is dominated by two compound classes: chalcones (led by panduratin A) and flavonoids (led by pinocembrin). These compounds are not present in Cekur (Kaempferia galanga), regular ginger, or turmeric. This is a pharmacologically distinct rhizome with a distinct compound profile and distinct mechanisms.
Panduratin A
The primary chalcone. Antiviral (SARS-CoV-2 3CLpro inhibition), anti-cancer (multiple cell lines including prostate, colon, breast), AMPK activation, pancreatic lipase inhibition, anti-inflammatory activity documented. One compound, multiple documented mechanisms across antiviral, anti-cancer, metabolic, and anti-inflammatory research areas.
Pinocembrin
Primary flavonoid. COX-2 inhibitory activity (anti-inflammatory mechanism), antifungal activity (including Candida species), antiviral activity, neuroprotective properties documented. Pinocembrin is also found in propolis (bee resin) — one of the best-studied antimicrobial flavonoids in natural product research.
4-Hydroxypanduratin A
Structural analogue of panduratin A with independent documented anti-cancer and anti-inflammatory activity. Synergistic with panduratin A in the anti-cancer profile — multiple chalcone compounds working through overlapping mechanisms rather than a single primary active compound.
Cardamonin
Chalcone with documented anti-cancer activity through NF-κB inhibition — the same master inflammatory switch targeted by Hempedu Bumi. Also demonstrates direct pro-apoptotic activity in cancer cell lines. Found across several Zingiberaceae family members but at particularly notable concentrations in Boesenbergia rotunda.
5,7-Dimethoxyflavone & Related
Additional flavonoid compounds contributing antioxidant and anti-inflammatory activity. Broaden the anti-inflammatory spectrum beyond COX-2 into antioxidant pathways — addressing the oxidative component of both the inflammatory conditions and the cancer-promoting oxidative environment.
Essential Oil Fraction
Camphene, borneol, and related terpenes. Contribute to the antimicrobial and respiratory applications. The essential oil fraction provides the aromatic character that makes Temukunci identifiable in Thai green curry — the same volatile compounds responsible for some of the antimicrobial activity.
Three Research Areas
When Traditional Antiviral Plants Met a Modern Pandemic
Thailand’s DMSC systematic screening of traditional medicinal plants identified Boesenbergia rotunda extract and panduratin A specifically as having significant anti-SARS-CoV-2 activity. The documented mechanism: inhibition of the SARS-CoV-2 main protease (3CLpro), which processes the viral polyprotein essential for replication. Without functional 3CLpro, the virus cannot produce the functional proteins needed to replicate.
Nirmatrelvir — the active component of Paxlovid — is also a 3CLpro inhibitor, though it works through covalent binding while panduratin A uses non-covalent binding. This is not a claim that Temukunci is equivalent to Paxlovid. It is a documentation of mechanistic convergence — a kitchen herb and a pharmaceutical antiviral targeting the same viral enzyme through different chemical pathways. The finding validates traditional antiviral plant screening as a rational drug discovery approach.
Pinocembrin has also been evaluated for antiviral activity, including against HIV and herpes viruses in preliminary studies, adding to the broad antiviral profile of the plant beyond the COVID-19 specific research.
Thailand DMSC COVID-19 research: panduratin A, SARS-CoV-2 3CLpro inhibition, IC50 5.83 μg/mL in Vero cell culture. Pinocembrin antiviral activity: HIV, HSV preliminary studies.
Panduratin A’s Documented Activity Across Multiple Cancer Types
Panduratin A demonstrates documented cytotoxicity against multiple cancer cell lines in vitro: prostate cancer (through androgen receptor signalling suppression), colon cancer (through NF-κB inhibition and apoptosis induction), breast cancer, and leukemia cell lines. The primary mechanisms include AMPK activation (depleting cancer cell energy through metabolic stress), mTOR pathway suppression (inhibiting cancer cell growth signalling), and direct pro-apoptotic activity.
The prostate cancer research is particularly notable: panduratin A suppresses androgen receptor (AR) signalling — the primary driver of androgen-sensitive prostate cancer progression. This is the same pathway targeted by pharmaceutical androgen deprivation therapies (enzalutamide, bicalutamide). The plant compound and the pharmaceutical drug target the same cancer driver through different chemical mechanisms.
Cardamonin contributes NF-κB inhibitory anti-cancer activity. 4-Hydroxypanduratin A adds additional anti-cancer activity through overlapping mechanisms. The whole-plant preparation delivers a multi-compound anti-cancer profile that no single pharmaceutical drug currently replicates.
Panduratin A anti-cancer activity: prostate cancer (AR suppression), colon cancer (NF-κB, apoptosis), breast cancer, leukemia. AMPK-mediated mechanism. Multiple in vitro studies. Cardamonin NF-κB anti-cancer activity documented.
AMPK Activation: The Metabolic Connection Between Antiviral, Anti-cancer, and Anti-obesity
AMPK (AMP-activated protein kinase) is a master metabolic regulator. Its activation produces: improved insulin sensitivity (anti-diabetic), enhanced fat oxidation (anti-obesity), suppression of mTOR cancer cell growth signalling (anti-cancer), and modulation of inflammatory pathways (anti-inflammatory). This is why metformin — an AMPK activator — shows anti-cancer effects alongside its blood sugar function.
Panduratin A activates AMPK, producing effects across all these connected pathways simultaneously. The traditional classification of Temukunci for digestive support, energy and fatigue, and general metabolic health was observing an AMPK-mediated biological reality without having the vocabulary to name it.
Pancreatic lipase inhibition adds an orlistat-like anti-obesity mechanism independent of the AMPK pathway — making Temukunci doubly relevant for fat metabolism through both lipase inhibition (reducing fat absorption) and AMPK activation (enhancing fat burning).
Panduratin A AMPK activation: documented. Anti-obesity: lipase inhibition + AMPK fat oxidation enhancement. mTOR suppression: anti-cancer metabolic mechanism. Metabolic syndrome applications: consistent with AMPK mechanism.
The Herb That Appeared in Thai Green Curry Before Anyone Read the Label
Krachai (Thailand) and Temukunci (Malaysia) occupy the same cultural position: present in the kitchen, rarely in the pharmacy, and almost never in the supplement aisle. Traditional Thai green curry uses fresh Krachai rhizomes specifically. Malaysian asam pedas and some traditional dishes use Temukunci.
Both culinary traditions had the panduratin A and pinocembrin in the pot decades before the DMSC COVID-19 research. The pandemic research did not discover the plant. It applied modern pharmacological instrumentation to something traditional practitioners had been using systematically for generations.
Thailand has invested more in Boesenbergia rotunda research than Malaysia — the COVID-19 work comes from a Thai government institution, and multiple Thai university research programmes have published on its anti-cancer properties. Malaysia uses the plant but has not produced the equivalent research infrastructure. This is not a pharmacological disadvantage — the plant is the same on both sides of the border. It is a research documentation gap.
The identification and visual confirmation matters: fresh Krachai/Temukunci in the Thai or Malaysian fresh market has the distinctive finger-like root cluster that no other common rhizome shares. If you can identify it, you can access it. If you cannot identify it, you are likely buying something else.
From Traditional Kitchen to Antiviral Research
Established in Thai, Malay, and Indonesian Traditions
Boesenbergia rotunda (Krachai/Temukunci) established across three traditional medicine systems for digestive conditions, respiratory infections, fatigue, and antifungal applications. Present in traditional cooking and medicine simultaneously — the boundary was never drawn.
Panduratin A Isolated and Characterised
The primary chalcone panduratin A isolated from Boesenbergia rotunda. Pinocembrin identified as primary flavonoid. Initial anti-cancer and anti-inflammatory studies begin. The distinctive compound profile distinguishes Boesenbergia from Kaempferia (Cekur) — confirming the taxonomic reclassification from Kaempferia pandurata to Boesenbergia rotunda.
Anti-cancer Research Programme Develops
Multiple Thai and international research institutions publish on panduratin A anti-cancer activity. Prostate cancer AR suppression, colon cancer NF-κB inhibition, AMPK activation — the anti-cancer mechanisms begin to emerge from systematic pharmacological research. The kitchen herb begins entering oncology literature.
COVID-19 Antiviral Research — Thailand DMSC
Thailand’s Department of Medical Sciences screens traditional medicinal plants for SARS-CoV-2 activity. Panduratin A demonstrates significant 3CLpro inhibitory activity (IC50 5.83 μg/mL). The finding generates international research interest and places a Thai kitchen herb in the global antiviral research conversation.
Continued Anti-cancer and Antiviral Research
Human clinical trials for panduratin A anti-cancer applications are in development. Antiviral research continues across multiple viral targets. The metabolic (AMPK, lipase inhibition) and anti-inflammatory applications are further characterised. The full pharmacological profile of this traditional kitchen herb continues to emerge.
Six Claims. Six Verdicts.
“Temukunci and Cekur are the same plant with different names.”
Cekur = Kaempferia galanga (genus Kaempferia). Primary compounds: EPMC and ethyl cinnamate (cinnamate esters). Temukunci = Boesenbergia rotunda (genus Boesenbergia, formerly Kaempferia pandurata). Primary compounds: panduratin A, pinocembrin (chalcones and flavonoids). Different genera, different compound classes, different pharmacological mechanisms. The former classification of Temukunci as Kaempferia pandurata caused this confusion — the reclassification into Boesenbergia was taxonomically correct and reflects the genuine pharmacological distinction. Visual identification is reliable: Temukunci has finger-like projecting rhizomes; Cekur has flat, disc-shaped rhizomes.
“The COVID-19 research means Temukunci cures or prevents COVID-19.”
Dismissing the research because it is “just a herb” is scientifically inaccurate — the mechanism is real, the assay conditions were rigorous, and 3CLpro inhibition is a validated antiviral drug target. But claiming Temukunci cures or prevents COVID-19 based on in vitro cell culture data is also inaccurate. In vitro IC50 does not translate directly to clinical dosing, bioavailability in human respiratory tissue, or clinical outcomes. The honest position: documented antiviral mechanism against the same target as Paxlovid, in cell culture, with the IC50 range published. Human clinical trials are needed before any clinical claim can be made.
“Panduratin A’s anti-cancer activity means Temukunci treats cancer.”
Panduratin A demonstrates documented cytotoxicity against prostate, colon, breast, and leukemia cell lines through documented mechanisms (AR suppression, AMPK, NF-κB, apoptosis). This is pharmacologically significant research. It does not constitute evidence for treating cancer with Temukunci preparations in lieu of oncological medical management. Human clinical trials for anti-cancer applications are not yet published. The research warrants continued development. The clinical claim cannot yet be made. The correct response to this finding is informed discussion with your oncologist — not unilateral supplementation during cancer treatment.
“The small amount in Thai green curry is too little to have any pharmacological effect.”
Culinary concentrations of panduratin A and pinocembrin are lower than therapeutic research doses. But the compounds are present and bioavailable — particularly in the fat-containing coconut milk matrix of Thai green curry, which enhances absorption of the lipophilic chalcones. The food-medicine boundary in traditional Thai practice was never absolute. Continuous dietary exposure to bioavailable anti-inflammatory and antimicrobial compounds through traditional cooking contributes to a pharmacological reality even if it does not constitute treatment-level dosing. The dose makes the medicine, but zero is not the right denominator.
“Any supplement labelled ‘fingerroot’ or ‘Krachai’ delivers panduratin A.”
Panduratin A is heat-labile — it degrades with prolonged heat. Commercial extract production methods that involve high-temperature processing may significantly reduce panduratin A content. Ethanolic extraction at moderate temperatures preserves panduratin A better than water extraction or high-temperature processing. The compound content also varies significantly with rhizome maturity, harvest timing, and geographic origin. Without a certificate of analysis disclosing panduratin A content by HPLC, a “fingerroot extract” supplement cannot be evaluated against the pharmacological research.
“Because Thailand did the COVID research, Temukunci is a Thai herb, not a Malaysian one.”
Boesenbergia rotunda is native to Southeast Asia broadly — Thailand, Malaysia, Indonesia, and neighbouring countries. It is called Krachai in Thailand, Temukunci in Malaysia, and Temu Kunci in Indonesia. The Thai DMSC conducted the COVID-19 research, but Thailand does not own the plant. The research was conducted on a plant that grows in Malaysian forests and appears in Malaysian traditional medicine and cooking. Thailand’s research infrastructure documented a pharmacological reality about a regional plant. Malaysia’s research gap is a documentation deficit, not a botanical one.
How to Use Temukunci
Fresh rhizome is the most complete preparation. Panduratin A is lipophilic — fat-containing preparations increase bioavailability. Avoid prolonged high heat: panduratin A is heat-labile. The traditional use in coconut milk curry is pharmacologically appropriate for the lipophilic compounds.
Method: Fresh Temukunci rhizomes added to Thai green curry, Malaysian asam pedas, stir-fries, or steamed fish preparations.
Pharmacological note: Panduratin A is lipophilic — fat-containing preparations (coconut milk, oil) significantly enhance absorption. Traditional fatty preparations were pharmacologically optimal for delivery.
Identification: Buy the finger-shaped root clusters — multiple elongated lobes projecting from a central body. No other common rhizome looks like this.
Method: Blend or grate fresh Temukunci with water. Strain. Drink with a small amount of fat (coconut milk, MCT oil) to enhance panduratin A absorption.
Dose guide: 10–20g fresh rhizome. Once daily for targeted applications.
Note: Mildly pungent and aromatic. Less intense than Cekur. Adding fat significantly improves bioavailability of the lipophilic active compounds.
Method: Commercial Boesenbergia rotunda extract standardised to panduratin A content.
Specify: Ethanolic extraction (not water extraction — panduratin A is poorly water-soluble). Panduratin A percentage disclosed. Boesenbergia rotunda species confirmed.
Note: Most consistent dosing for targeted applications. The research IC50 values are from standardised extracts. Without panduratin A content disclosed, potency cannot be estimated.
Method: For antifungal applications (skin Candida, oral Candida), the leaf and root preparation delivered topically or as a concentrated tea has documented antifungal activity from pinocembrin.
Note: Pinocembrin is water-soluble (unlike panduratin A) and is extracted effectively in tea preparations. For antifungal applications specifically, water-based preparations are pharmacologically appropriate.
COVID-19 research is in vitro only: The 3CLpro inhibitory activity was demonstrated in cell culture. Human pharmacokinetic data, respiratory tissue bioavailability, and clinical outcome trials for COVID-19 are not published. The mechanism is real; the clinical application requires human trials.
Anti-cancer research is pre-clinical: Panduratin A’s anti-cancer activity is documented in cell culture and animal models. Human clinical trials are not yet published at scale. Do not use Temukunci as a cancer treatment. The finding warrants continued research and informed discussion with oncologists.
Panduratin A is heat-labile: Prolonged cooking at high temperatures degrades panduratin A. Traditional preparations that add Temukunci towards the end of cooking or in lower-heat preparations preserve more active compound. High-temperature extract processing reduces panduratin A content.
Species and market labelling: Temukunci, Temu Kunci, and Krachai all refer to Boesenbergia rotunda and are correct. Products labelled “fingerroot” may occasionally be Cekur (Kaempferia galanga) in error. Visual identification of the finger-like root morphology is the most reliable quality marker.
References & Sources ↓
- Thailand DMSC COVID-19 antiviral research: panduratin A, SARS-CoV-2 3CLpro inhibition, IC50 5.83 μg/mL in Vero cell culture. Published 2020–2021.
- Panduratin A anti-cancer activity: prostate cancer (AR suppression), colon cancer (NF-κB, apoptosis), breast cancer, leukemia. AMPK-mediated mechanism. Multiple published studies, Thai and international institutions.
- Pinocembrin: COX-2 inhibitory activity, antifungal (Candida species), antiviral activity, neuroprotective properties. Well-documented in propolis and Boesenbergia rotunda research.
- Panduratin A AMPK activation: documented. mTOR suppression, insulin sensitivity improvement, fat oxidation enhancement, anti-cancer metabolic mechanism.
- Pancreatic lipase inhibition: panduratin A documented. Anti-obesity mechanism comparable to orlistat. Combined with AMPK fat oxidation enhancement.
- Cardamonin: NF-κB anti-cancer activity, pro-apoptotic activity in cancer cell lines. Additional chalcone in Boesenbergia rotunda.
- Panduratin A heat lability: degradation at high temperatures. Pharmacological implications for preparation method selection.
- Species reclassification: from Kaempferia pandurata to Boesenbergia rotunda. Taxonomic distinction from Kaempferia galanga (Cekur) pharmacologically validated by distinct compound profiles.
- Traditional documentation: Thai (Krachai), Malaysian (Temukunci), Indonesian (Temu Kunci) ethnobotanical records. Digestive, respiratory, antifungal applications across three traditions.