Palmatine

Palmatine at a Glance

Palmatine is a bright-yellow protoberberine alkaloid — the close chemical cousin of berberine, and structurally almost the same molecule. It occurs in the same roots and barks: calumba, Chinese goldthread (Coptis), Amur cork tree (Phellodendron), barberry and several tropical vines.

Its pharmacology reads like a quieter echo of berberine’s. In animals and cell studies palmatine acts on the same metabolic and inflammatory pathways — AMPK, glucose and lipid handling, the NLRP3 inflammasome — and it shares berberine’s defining weakness, poor oral absorption. The crucial difference is the weight of evidence: berberine has dozens of human randomized trials, while palmatine has none. Every claim below rests on preclinical data.

The honest framing is that palmatine is a real, moderately-studied molecule with plausible mechanisms and no clinical validation — interesting mostly as berberine’s under-studied relative, and as the signature alkaloid of a few plants (calumba, Fibraurea) where it, not berberine, dominates.

Palmatine vs. Berberine

Palmatine is best understood next to berberine, because the two are nearly interchangeable on paper and constantly co-occur in the same plants.

The structures differ in one ring. Both are protoberberine (quaternary isoquinoline) alkaloids. Berberine carries a methylenedioxy bridge across two of its aromatic carbons; in palmatine that bridge is opened into two separate methoxy groups, making palmatine the fully tetramethoxy protoberberine. Otherwise the cationic yellow scaffold is the same.

The mechanisms overlap almost completely. Palmatine hits the same targets berberine is known for — AMPK activation, improved glucose and lipid handling, NLRP3-inflammasome suppression, broad antimicrobial activity ^{2,3Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →Reference 3Ekeuku SO et al. · 2020ReviewPalmatine as an agent against metabolic syndrome and its related complications — reviewView study →}. Both are also quaternary cations that absorb poorly by mouth and are pumped back into the gut by P-glycoprotein ^{1,13Reference 1Long J et al. · 2019ReviewPalmatine: a review of its pharmacology, toxicity and pharmacokinetics — reviewView study →Reference 13Zheng JY et al. · 2017AnimalPharmacokinetics and oral bioavailability of palmatine and jatrorrhizine in Huangteng in rats — rat PK studyView study →}.

The evidence does not. This is the whole story. Berberine’s metabolic effects have been tested in many human RCTs and meta-analyses; palmatine has not been run in a single clinical trial ^{2,3Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →Reference 3Ekeuku SO et al. · 2020ReviewPalmatine as an agent against metabolic syndrome and its related complications — reviewView study →}. Much of palmatine’s reputation is borrowed — inferred from berberine, or from whole-plant protoberberine mixtures where the two travel together.

Palmatine has its own turf. It is the dominant protoberberine — and the namesake alkaloid — of calumba (Jateorhiza palmata) and the vine Fibraurea recisa, and a major alkaloid of Phellodendron bark, plants where berberine is comparatively minor. Where the calumba/Phellodendron literature exists, it is genuinely palmatine’s.

The fair summary: palmatine is berberine’s poor cousin — same chemistry, same mechanisms, same terrible bioavailability, a fraction of the data, and no human evidence.

What It's Used For

Palmatine’s research base is entirely preclinical — isolated-compound studies in rodents, cell lines and invertebrate models, plus one multi-herb formula in which palmatine is a named active. No application has been tested as isolated palmatine in humans.

Evidence by IndicationStrength of support · Beta

Support is an experimental score I’m building — a composite weighted by study type (human > animal > in vitro > review) and volume, tempered for isolate-vs-plant match and bioavailability. It’s a beta, not a validated metric, and for palmatine every score is capped low by the total absence of human data. Each application links to its write-up.

01Metabolic SyndromeShaky44%Rat + β-cell studies and reviews; AMPK/FGFR1/MAPK mechanisms; no human data ^{3,4,5Reference 3Ekeuku SO et al. · 2020ReviewPalmatine as an agent against metabolic syndrome and its related complications — reviewView study →Reference 4Tian X et al. · 2020AnimalPalmatine ameliorates high fat diet induced impaired glucose tolerance — rat & β-cell studyView study →Reference 5Li S et al. · 2022The hypoglycemic effect of JinQi Jiangtang tablets is partially dependent on the palmatine-induced activation of the fibroblast growth factor receptor 1 signaling pathway — animal/mechanistic studyView study →}

02Ulcerative ColitisShaky42%Two mouse DSS-colitis studies; NLRP3-mitophagy + microbiota/tryptophan ^{6,7Reference 6Mai CT et al. · 2019AnimalPalmatine attenuated dextran sulfate sodium (DSS)-induced colitis via promoting mitophagy-mediated NLRP3 inflammasome inactivation — mouse & macrophage studyView study →Reference 7Zhang XJ et al. · 2018AnimalPalmatine ameliorated murine colitis by suppressing tryptophan metabolism and regulating gut microbiota — mouse studyView study →}

03Neuroprotection and Alzheimer’sShaky34%AD-model mice + C. elegans + AChE synergy — preclinical ^{8,9,10Reference 8Lee DY et al. · 2023AnimalThe natural alkaloid palmatine selectively induces mitophagy and restores mitochondrial function in an Alzheimer’s disease mouse model — PS2APP mouse studyView study →Reference 9Jia W et al. · 2021Neuroprotective effects of palmatine via the enhancement of antioxidant defense and small heat shock protein expression in Aβ-transgenic Caenorhabditis elegans — invertebrate modelView study →Reference 10Mak S et al. · 2014Synergistic inhibition on acetylcholinesterase by the combination of berberine and palmatine originally isolated from Chinese medicinal herbs — enzyme studyView study →}

04Antimicrobial and AntifungalShaky30%In-vitro azole synergy vs Candida; anti-H. pylori urease ^{11,2Reference 11Wang T et al. · 2018In vitroStrong synergism of palmatine and fluconazole/itraconazole against planktonic and biofilm cells of Candida species and efflux-associated antifungal mechanism — in vitroView study →Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →}

05Antimalarial ActivityShaky22%In vitro ≈ quinine, but inactive in vivo ^{12Reference 12Vennerstrom JL · 1988In vitroProtoberberine alkaloids as antimalarials — in vitro & in vivoView study →}

Mechanisms

Pharmacokinetics

Like berberine, palmatine is a quaternary cation with poor oral absorption, but its numbers are a notch better than its cousin’s. In rats, oral bioavailability was measured at about 11% (reviews put it at “no more than 10%”), versus berberine’s <1% ^{1,2,13Reference 1Long J et al. · 2019ReviewPalmatine: a review of its pharmacology, toxicity and pharmacokinetics — reviewView study →Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →Reference 13Zheng JY et al. · 2017AnimalPharmacokinetics and oral bioavailability of palmatine and jatrorrhizine in Huangteng in rats — rat PK studyView study →}. The limiting factors are the same: low membrane permeability and active P-glycoprotein efflux back into the gut ^{1,13Reference 1Long J et al. · 2019ReviewPalmatine: a review of its pharmacology, toxicity and pharmacokinetics — reviewView study →Reference 13Zheng JY et al. · 2017AnimalPharmacokinetics and oral bioavailability of palmatine and jatrorrhizine in Huangteng in rats — rat PK studyView study →}. Once absorbed, palmatine is cleared mainly by phase-II conjugation — glucuronidation and sulfation — and reviews note it has complex effects on hepatic drug-metabolizing enzymes ^{1Reference 1Long J et al. · 2019ReviewPalmatine: a review of its pharmacology, toxicity and pharmacokinetics — reviewView study →}. Reported oral exposure is modest (Cmax ≈ 273 ng/mL at 60 mg/kg in rats) ^{2Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →}. The practical reading: even at ~10%, systemic levels stay low, so gut-luminal actions (colitis, antimicrobial) are more plausible than effects requiring high blood concentrations, and the in-vivo antimalarial failure fits that picture ^{12Reference 12Vennerstrom JL · 1988In vitroProtoberberine alkaloids as antimalarials — in vitro & in vivoView study →}.

Clinical Trials

There are no clinical trials of isolated palmatine. Human exposure has only ever been as one alkaloid within traditional plant or multi-herb preparations (e.g. JinQi Jiangtang tablets), not as a mono-compound intervention ^{3,5Reference 3Ekeuku SO et al. · 2020ReviewPalmatine as an agent against metabolic syndrome and its related complications — reviewView study →Reference 5Li S et al. · 2022The hypoglycemic effect of JinQi Jiangtang tablets is partially dependent on the palmatine-induced activation of the fibroblast growth factor receptor 1 signaling pathway — animal/mechanistic studyView study →}.

Last checked: July 2026.

Isolate vs. Plant Studies

Palmatine’s evidence splits cleanly, and neither half reaches humans. The isolated-compound work — the colitis, metabolic, neuroprotection and antimicrobial studies — used purified palmatine, so those results genuinely describe the molecule, but only in animals and cells ^{4,6,8,11Reference 4Tian X et al. · 2020AnimalPalmatine ameliorates high fat diet induced impaired glucose tolerance — rat & β-cell studyView study →Reference 6Mai CT et al. · 2019AnimalPalmatine attenuated dextran sulfate sodium (DSS)-induced colitis via promoting mitophagy-mediated NLRP3 inflammasome inactivation — mouse & macrophage studyView study →Reference 8Lee DY et al. · 2023AnimalThe natural alkaloid palmatine selectively induces mitophagy and restores mitochondrial function in an Alzheimer’s disease mouse model — PS2APP mouse studyView study →Reference 11Wang T et al. · 2018In vitroStrong synergism of palmatine and fluconazole/itraconazole against planktonic and biofilm cells of Candida species and efflux-associated antifungal mechanism — in vitroView study →}. The plant/formula context is the JinQi Jiangtang tablet, where palmatine is one active among many and its effect is inferred from a fraction of the whole product ^{5Reference 5Li S et al. · 2022The hypoglycemic effect of JinQi Jiangtang tablets is partially dependent on the palmatine-induced activation of the fibroblast growth factor receptor 1 signaling pathway — animal/mechanistic studyView study →}. Traditional use of calumba, coptis, Phellodendron and barberry roots is attributed to a mixture of protoberberines — berberine, palmatine, jatrorrhizine, columbamine, coptisine — so a whole-root effect cannot be assigned to palmatine alone. Unlike berberine, palmatine has no human isolate trials to anchor the molecule-level claims; read every result here as preclinical.

Its Role in Plants

Palmatine is a benzylisoquinoline (protoberberine) alkaloid, built — like berberine — from two molecules of the amino acid tyrosine through the shared (S)-reticuline branch point of this alkaloid family. It sits at the fully O-methylated end of the protoberberine series: columbamine and jatrorrhizine are progressively methylated to give palmatine, which is why the three so often co-occur.

In the plant it is a yellow pigment and a defensive alkaloid, concentrated in roots, rhizomes and bark rather than leaves — tissues where a bitter, antimicrobial quaternary alkaloid deters herbivores and pathogens. Its intense colour has long doubled as a natural dye, the same property that made these roots recognisable in traditional medicine.

Prevalence in Nature

Palmatine occurs across several alkaloid-rich plant families, always in the underground or bark tissues ^{2Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →}:

• Menispermaceae — calumba (Jateorhiza palmata), the eponymous source, plus the vines Fibraurea recisa, Tinospora and Stephania species.
• Ranunculaceae — Chinese goldthread (Coptis chinensis) and Thalictrum species.
• Rutaceae — Amur cork tree (Phellodendron amurense), where it accompanies berberine and jatrorrhizine in the bark.
• Berberidaceae — barberry (Berberis) and relatives, as a minor partner to berberine.

Quantitatively it is usually the junior alkaloid. In Coptis chinensis rhizome, optimized extraction recovered about 16.7 mg/g palmatine (~1.7% dry weight) against ~57 mg/g berberine — roughly a threefold berberine lead ^{14Reference 14Li L et al. · 2021Effective extraction of palmatine and berberine from Coptis chinensis by deep eutectic solvents-based ultrasound-assisted extraction — analytical studyView study →}. Phellodendron amurense bark carries less, around 1.25–2.53 mg/g (~0.12–0.25%) ^{2Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →}. Calumba root is the exception that names the molecule: its ~2–3% total alkaloids are chiefly protoberberines (palmatine, jatrorrhizine, columbamine) with little berberine, so palmatine is a leading component there.

Major Natural Sources

Source (Botanical)	Family	Part	Palmatine notes
Calumba (Jateorhiza palmata)	Menispermaceae	Root	Eponymous, protoberberine-dominant; palmatine a leading alkaloid
Chinese goldthread (Coptis chinensis)	Ranunculaceae	Rhizome	~1.7% dry wt; secondary to berberine 14Reference 14Li L et al. · 2021Effective extraction of palmatine and berberine from Coptis chinensis by deep eutectic solvents-based ultrasound-assisted extraction — analytical studyView study →
Amur cork tree (Phellodendron amurense)	Rutaceae	Bark	~0.12–0.25% dry wt 2Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →
Fibraurea (Fibraurea recisa)	Menispermaceae	Stem	Palmatine a principal alkaloid
Barberry (Berberis vulgaris)	Berberidaceae	Root bark	Minor, alongside berberine

Other Reported Sources

Corydalis yanhusuo (Papaveraceae), Thalictrum species, Tinospora and Stephania species, and other Menispermaceae vines carry palmatine as a minor-to-moderate protoberberine constituent ^{2Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →}.

Discovery & Synthesis

Palmatine is named after calumba, Jateorhiza palmata — the “palmata” referring to the plant’s palm-shaped (palmate) leaves — from whose bitter root the protoberberine alkaloids were characterised; it was among the alkaloids obtained from these yellow roots in the nineteenth century ^{2Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →}. Its first dedicated total synthesis is not well documented in the accessible literature (protoberberines as a class have been synthesised, but palmatine is rarely a made molecule).

Manufacture today is by extraction, not synthesis. Commercial palmatine is isolated from plants that are rich in it — Phellodendron bark, Coptis rhizome, Fibraurea stem and calumba — typically as the chloride salt, and often co-purified with berberine and jatrorrhizine from the same alkaloid fraction ^{2,14Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →Reference 14Li L et al. · 2021Effective extraction of palmatine and berberine from Coptis chinensis by deep eutectic solvents-based ultrasound-assisted extraction — analytical studyView study →}. Because these plant sources are cheap and alkaloid-dense, there is no economic reason to synthesise it.

Patents: not yet researched.

Toxicity & Safety

Palmatine carries a low flag: it has a long traditional-use record inside calumba, coptis and phellodendron preparations and no signal of acute toxicity in animal work at studied doses. The caveats are that it has no human safety data at all, and that a review has flagged a genotoxicity concern for the isolated compound.

Safety at a Glance

✅ Low / no toxicity

• No acute-toxicity signal in animals. Studied at 40–100 mg/kg in rodents without reported serious harm; long history as a minor alkaloid of edible/medicinal roots.
• Reported DNA toxicity. A pharmacology/toxicity review flags “obvious DNA toxicity” for isolated palmatine — expected for a protoberberine (the class can intercalate DNA / affect topoisomerase), so high-dose or prolonged isolate use is not established as safe.
• Complex effects on liver drug-metabolizing enzymes. Reviews note palmatine perturbs hepatic metabolic enzymes, implying a theoretical drug-interaction potential that has not been mapped in humans.
• No human data. No clinical safety studies, no established maximum dose, and pharmacokinetics characterised only in animals.

Full Safety & Interactions Detail

Palmatine is generally well tolerated in animal studies at the doses used for efficacy (roughly 40–100 mg/kg), with no consistent acute-toxicity signal reported ^{4,6Reference 4Tian X et al. · 2020AnimalPalmatine ameliorates high fat diet induced impaired glucose tolerance — rat & β-cell studyView study →Reference 6Mai CT et al. · 2019AnimalPalmatine attenuated dextran sulfate sodium (DSS)-induced colitis via promoting mitophagy-mediated NLRP3 inflammasome inactivation — mouse & macrophage studyView study →}.

The most-cited safety concern is from a dedicated pharmacology/toxicity review, which states palmatine has “obvious DNA toxicity” and complex effects on hepatic metabolic enzymes ^{1Reference 1Long J et al. · 2019ReviewPalmatine: a review of its pharmacology, toxicity and pharmacokinetics — reviewView study →} — findings consistent with the protoberberine class, whose planar cationic scaffold can interact with DNA and topoisomerases (the same chemistry behind the DNA-damage discussion around berberine and its metabolites). Because palmatine is cleared largely by glucuronidation and sulfation, competition at those conjugation pathways is a plausible but uncharacterised interaction route ^{1Reference 1Long J et al. · 2019ReviewPalmatine: a review of its pharmacology, toxicity and pharmacokinetics — reviewView study →}.

Reproductive note (prose only). No dedicated reproductive- or developmental-toxicity dataset exists for isolated palmatine. As a protoberberine closely related to berberine — which displaces bilirubin from serum albumin and is contraindicated in pregnancy, breastfeeding and neonates — palmatine plausibly shares that liability, but this has not been specifically tested; caution in pregnancy and in neonates is prudent rather than proven. Pregnancy/lactation decisions belong to the herb or product page where intake is actually decided, not to this molecule page.

Dosage

There is no human dose for palmatine — it has never been given as an isolated drug in a clinical trial, and the figures below are the exposures used in animal research, not recommendations.

Human exposure occurs only indirectly, as a minor protoberberine within calumba, coptis, phellodendron or barberry preparations standardised (if at all) to total alkaloids or to berberine rather than to palmatine ^{2,5Reference 2Shi Z et al. · 2025ReviewFrom traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — reviewView study →Reference 5Li S et al. · 2022The hypoglycemic effect of JinQi Jiangtang tablets is partially dependent on the palmatine-induced activation of the fibroblast growth factor receptor 1 signaling pathway — animal/mechanistic studyView study →}. These are doses studied in research and are not a personal recommendation.

References

1. Long J, Song J, Zhong L, Liao Y, Liu L, Li X. (2019). Palmatine: a review of its pharmacology, toxicity and pharmacokinetics — review. Biochimie, 162, 176–184. https://pubmed.ncbi.nlm.nih.gov/31051209/
2. Shi Z, Han L, Yang H, Lu G, Shi Z, Ma B. (2025). From traditional remedy to modern therapy: a comprehensive review of palmatine’s multi-target mechanisms and ethnopharmacological potential — review. Frontiers in Pharmacology, 16, 1624353. https://pubmed.ncbi.nlm.nih.gov/40786032/
3. Ekeuku SO, Pang KL, Chin KY. (2020). Palmatine as an agent against metabolic syndrome and its related complications — review. Drug Design, Development and Therapy, 14, 4963–4974. https://pubmed.ncbi.nlm.nih.gov/33235437/
4. Tian X, Zhang Y, Li H, Li Y, Wang N, Zhang W, Ma B. (2020). Palmatine ameliorates high fat diet induced impaired glucose tolerance — rat & β-cell study. Biological Research, 53(1), 39. https://pubmed.ncbi.nlm.nih.gov/32928312/
5. Li S, Li X, Wang H, Jia X, Mao H, Dong F, et al. (2022). The hypoglycemic effect of JinQi Jiangtang tablets is partially dependent on the palmatine-induced activation of the fibroblast growth factor receptor 1 signaling pathway — animal/mechanistic study. Frontiers in Pharmacology, 13, 895724. https://pubmed.ncbi.nlm.nih.gov/35935824/
6. Mai CT, Wu MM, Wang CL, Su ZR, Cheng YY, Zhang XJ. (2019). Palmatine attenuated dextran sulfate sodium (DSS)-induced colitis via promoting mitophagy-mediated NLRP3 inflammasome inactivation — mouse & macrophage study. Molecular Immunology, 105, 76–85. https://pubmed.ncbi.nlm.nih.gov/30496979/
7. Zhang XJ, Yuan ZW, Qu C, Yu XT, Huang T, Chen PV, et al. (2018). Palmatine ameliorated murine colitis by suppressing tryptophan metabolism and regulating gut microbiota — mouse study. Pharmacological Research, 137, 34–46. https://pubmed.ncbi.nlm.nih.gov/30243842/
8. Lee DY, Lee KM, Um JH, Kim YY, Kim DH, Yun J. (2023). The natural alkaloid palmatine selectively induces mitophagy and restores mitochondrial function in an Alzheimer’s disease mouse model — PS2APP mouse study. International Journal of Molecular Sciences, 24(22), 16542. https://pubmed.ncbi.nlm.nih.gov/38003731/
9. Jia W, Su Q, Cheng Q, Peng Q, Qiao A, Luo X, Zhang J, Wang Y. (2021). Neuroprotective effects of palmatine via the enhancement of antioxidant defense and small heat shock protein expression in Aβ-transgenic Caenorhabditis elegans — invertebrate model. Oxidative Medicine and Cellular Longevity, 2021, 9966223. https://pubmed.ncbi.nlm.nih.gov/34567416/
10. Mak S, Luk WWK, Cui W, Hu S, Tsim KWK, Han Y. (2014). Synergistic inhibition on acetylcholinesterase by the combination of berberine and palmatine originally isolated from Chinese medicinal herbs — enzyme study. Journal of Molecular Neuroscience, 53(3), 511–516. https://pubmed.ncbi.nlm.nih.gov/24793543/
11. Wang T, Shao J, Da W, Li Q, Shi G, Wu D, Wang C. (2018). Strong synergism of palmatine and fluconazole/itraconazole against planktonic and biofilm cells of Candida species and efflux-associated antifungal mechanism — in vitro. Frontiers in Microbiology, 9, 2892. https://pubmed.ncbi.nlm.nih.gov/30559726/
12. Vennerstrom JL, Klayman DL. (1988). Protoberberine alkaloids as antimalarials — in vitro & in vivo. Journal of Medicinal Chemistry, 31(6), 1084–1087. https://pubmed.ncbi.nlm.nih.gov/3286870/
13. Zheng JY, Li GF, He ZM, Zhu HY, Zhao Y, Gao YG, Yang H, Zhang LX. (2017). Pharmacokinetics and oral bioavailability of palmatine and jatrorrhizine in Huangteng in rats — rat PK study. Zhongguo Zhong Yao Za Zhi (China Journal of Chinese Materia Medica), 42(13), 2589–2594. https://pubmed.ncbi.nlm.nih.gov/29098836/
14. Li L, Zhang D, Wang Y, Liu F, Xu Y, Bao H. (2021). Effective extraction of palmatine and berberine from Coptis chinensis by deep eutectic solvents-based ultrasound-assisted extraction — analytical study. Journal of Analytical Methods in Chemistry, 2021, 9970338. https://pubmed.ncbi.nlm.nih.gov/34422435/

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