Scoparone

Scoparone at a Glance

Scoparone, or 6,7-dimethoxycoumarin, is a simple coumarin — the dimethyl ether of the dihydroxycoumarin esculetin. It takes its name from Scotch broom (Cytisus scoparius), but its best-known botanical home is yin chen hao (Artemisia capillaris), the herb at the centre of the classical Chinese decoction Yin-Chen-Hao Tang used for jaundice and cholestasis for more than a thousand years ^{1Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →}.

Most modern interest in scoparone follows that tradition: it is the Artemisia constituent most often credited with hepatoprotective and choleretic activity, and reviews now catalogue anti-inflammatory, antioxidant, anti-fibrotic, hypolipidemic, vasorelaxant, antidiabetic and immunosuppressive effects on top of it ^{1,2Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 2Hanh NT et al. · 2026ReviewRecent advances in bioactive coumarin scoparone: A comprehensive reviewView study →}. It is a simple coumarin, not a furanocoumarin — it has no furan ring — so it does not carry the phototoxic / photocarcinogenic liability of psoralen-type molecules like bergapten or xanthotoxin.

The honest headline is that this entire pharmacology is preclinical. The evidence is cell-culture and rodent work — much of it on the isolated molecule, some of it as one active component of a multi-herb formula — and there are no human clinical trials of scoparone as an isolated drug ^{1,2Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 2Hanh NT et al. · 2026ReviewRecent advances in bioactive coumarin scoparone: A comprehensive reviewView study →}.

The Yin Chen Hao Jaundice Tradition

Scoparone’s marquee role is inseparable from yin chen hao (Artemisia capillaris / A. scoparia), one of the oldest liver herbs in Chinese medicine. The decoction Yin-Chen-Hao Tang has been used for hepatic dysfunction, cholestasis and jaundice for over a thousand years, and scoparone is repeatedly identified as an active, efficacious constituent behind that use ^{1,3Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 3Cai Y et al. · 2020Recent progress in the study of Artemisiae Scopariae Herba (Yin Chen), a promising medicinal herb for liver diseasesView study →}.

In preclinical models the molecule behaves like a broad hepatoprotectant. In rodents given alcohol and high-fat diet, scoparone reduced liver injury, with RNA-sequencing pointing to effects on lipid-metabolism and inflammatory gene programmes ^{4Reference 4Wei M et al. · 2022The effects of scoparone on alcohol and high-fat diet-induced liver injury revealed by RNA sequencingView study →}. It figures as an active component in modern Artemisia-based and multi-herb formulas studied against cholestatic liver fibrosis, where the mechanistic work implicates the PDGFRβ/PI3K/AKT pathway ^{5Reference 5Meng Q et al. · 2024AnimalQuantitative proteomics reveals the protective effects of Yinchenzhufu decoction against cholestatic liver fibrosis in mice by inhibiting the PDGFRβ/PI3K/AKT pathwayView study →}. Reviews summarise the isolate’s liver actions as anti-inflammatory, antioxidant, anti-apoptotic, anti-fibrotic and hypolipidemic, converging on cholestasis, fibrosis and fatty-liver models ^{1,2Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 2Hanh NT et al. · 2026ReviewRecent advances in bioactive coumarin scoparone: A comprehensive reviewView study →}.

Two honest caveats belong beside the tradition. First, all of this is animal and cell data — the thousand-year clinical record is for the whole herb / decoction, not for measured doses of the pure molecule. Second, scoparone is one of several coumarins in Artemisia (alongside its relatives scopoletin and esculetin), so the herb’s effect cannot be reduced to scoparone alone.

What It's Used For

Beyond the liver story, scoparone has been screened across inflammation, vascular biology, metabolism and immunity. The pattern is consistent: plausible mechanisms demonstrated in vitro or in rodents, no human outcome data, and a recurring theme of the molecule tamping down oxidative stress and MAPK/NF-κB-type inflammatory signalling.

Evidence by IndicationStrength of support · Beta

Support is an experimental score — weighted by study type (human > animal > in vitro) and volume. A beta, not a validated metric. Every row here rests on preclinical work, so the scores rank depth of preclinical evidence, not proven human benefit.

01Hepatoprotection & CholestasisPromising48%Long yin-chen-hao tradition + multiple rodent liver-injury models + reviews (all preclinical) ^{1,2,4Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 2Hanh NT et al. · 2026ReviewRecent advances in bioactive coumarin scoparone: A comprehensive reviewView study →Reference 4Wei M et al. · 2022The effects of scoparone on alcohol and high-fat diet-induced liver injury revealed by RNA sequencingView study →}

02Anti-InflammatoryShaky40%Rat TNBS colitis + macrophage-polarisation and LPS in-vitro work ^{6,7Reference 6Witaicenis A et al. · 2014Antioxidant and intestinal anti-inflammatory effects of plant-derived coumarin derivativesView study →Reference 7Yeh YT et al. · 2023Identification of scoparone from Chinese olive fruit as a modulator of macrophage polarizationView study →}

03Vasorelaxant / AntihypertensiveShaky34%Isolate vasorelaxation in Tagetes lucida studies + anti-migratory VSMC / neointima data ^{8,9Reference 8Estrada-Soto S et al. · 2021Antihypertensive and vasorelaxant mode of action of the ethanol-soluble extract from Tagetes lucida Cav. aerial parts and its main bioactive metabolitesView study →Reference 9Jung SH et al. · 2019Inhibitory effects of scoparone from chestnut inner shell on platelet-derived growth factor-BB-induced vascular smooth muscle cell migration and vascular neointima hyperplasiaView study →}

04Antidiabetic & RenoprotectiveShaky26%In-vitro high-glucose mesangial-cell protection; broader antidiabetic claims are review-level ^{2,11Reference 2Hanh NT et al. · 2026ReviewRecent advances in bioactive coumarin scoparone: A comprehensive reviewView study →Reference 11Wang Y et al. · 2017AnimalScoparone attenuates high glucose-induced extracellular matrix accumulation in rat mesangial cellsView study →}

05ImmunosuppressiveShaky22%In-vitro lymphocyte-proliferation / Treg work, scoparone one of several coumarins ^{12Reference 12Hou WR et al. · 2010Immunosuppressive constituents from Urtica dentata HandView study →}

Mechanisms

The through-line is oxidative-stress and MAPK/NF-κB damping — the same machinery invoked in the liver, the gut, blood vessels and the kidney. That mechanistic coherence is a strength; the ceiling is that it is demonstrated in cells and rodents, not people.

Pharmacokinetics

Scoparone is a small, lipophilic coumarin, readily taken up in cell and animal studies, but its whole-body kinetics carry two caveats that matter for reading its in-vitro potency. First, it is rapidly metabolised: O-demethylation yields scopoletin and isoscopoletin as major primary metabolites, so a dose of scoparone partly becomes another bioactive coumarin ^{1,10Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 10Tian Q et al. · 2023AnimalComparative pharmacokinetics of scoparone and its metabolite scopoletin in normal and ANIT-induced intrahepatic cholestatic ratsView study →}. Second, its systemic exposure is state-dependent — hepatic dysfunction can raise scoparone’s bioavailability because impaired liver clearance limits its intrinsic metabolism, an unusual feature for a liver drug in that the diseased target organ increases exposure ^{1Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →}. Comparative work in normal versus ANIT-induced cholestatic rats confirms that both the parent and the scopoletin metabolite show altered pharmacokinetics under cholestasis ^{10Reference 10Tian Q et al. · 2023AnimalComparative pharmacokinetics of scoparone and its metabolite scopoletin in normal and ANIT-induced intrahepatic cholestatic ratsView study →}.

Clinical Trials

There are no human clinical trials of isolated scoparone. The entire evidence base is in-vitro and animal, plus human use of the whole herb yin chen hao and its multi-herb decoctions — a different thing from a measured dose of the pure molecule.

Last checked: July 2026.

Isolate vs. Plant Studies

Scoparone sits in a middle position on the isolate-versus-plant axis. Much of its pharmacology is run on the pure molecule — the alcohol/high-fat-diet liver study ^{4Reference 4Wei M et al. · 2022The effects of scoparone on alcohol and high-fat diet-induced liver injury revealed by RNA sequencingView study →}, the mesangial-cell and macrophage work ^{7,11Reference 7Yeh YT et al. · 2023Identification of scoparone from Chinese olive fruit as a modulator of macrophage polarizationView study →Reference 11Wang Y et al. · 2017AnimalScoparone attenuates high glucose-induced extracellular matrix accumulation in rat mesangial cellsView study →}, the chestnut-shell vascular study ^{9Reference 9Jung SH et al. · 2019Inhibitory effects of scoparone from chestnut inner shell on platelet-derived growth factor-BB-induced vascular smooth muscle cell migration and vascular neointima hyperplasiaView study →} and the coumarin comparison in colitis ^{6Reference 6Witaicenis A et al. · 2014Antioxidant and intestinal anti-inflammatory effects of plant-derived coumarin derivativesView study →} all test isolated scoparone. That is a genuine strength over molecules known only from whole-extract assays.

But its headline clinical credibility comes from the plant: the anti-jaundice reputation belongs to the Yin-Chen-Hao decoction and to Artemisia capillaris, where scoparone is one coumarin among several (with scopoletin and esculetin) and where formula-level studies deliberately test the mixture ^{1,3,5Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 3Cai Y et al. · 2020Recent progress in the study of Artemisiae Scopariae Herba (Yin Chen), a promising medicinal herb for liver diseasesView study →Reference 5Meng Q et al. · 2024AnimalQuantitative proteomics reveals the protective effects of Yinchenzhufu decoction against cholestatic liver fibrosis in mice by inhibiting the PDGFRβ/PI3K/AKT pathwayView study →}. So the transferability caveat runs the usual way — the human tradition is for the herb, and no trial has isolated what the pure molecule contributes.

Prevalence in Nature

Scoparone is a widespread simple coumarin rather than a single-plant marker. Its two best-characterised sources are yin chen hao (Artemisia capillaris and A. scoparia), where it is a signature bioactive constituent ^{1,3Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 3Cai Y et al. · 2020Recent progress in the study of Artemisiae Scopariae Herba (Yin Chen), a promising medicinal herb for liver diseasesView study →}, and Scotch broom (Cytisus scoparius), from which it was named and where it occurs in the flavonoid–coumarin background fraction. It is also one of the coumarins isolated from Mexican tarragon (Tagetes lucida) aerial parts ^{8Reference 8Estrada-Soto S et al. · 2021Antihypertensive and vasorelaxant mode of action of the ethanol-soluble extract from Tagetes lucida Cav. aerial parts and its main bioactive metabolitesView study →}, from chestnut inner shell (Castanea crenata) ^{9Reference 9Jung SH et al. · 2019Inhibitory effects of scoparone from chestnut inner shell on platelet-derived growth factor-BB-induced vascular smooth muscle cell migration and vascular neointima hyperplasiaView study →}, from Chinese olive fruit (Canarium album) ^{7Reference 7Yeh YT et al. · 2023Identification of scoparone from Chinese olive fruit as a modulator of macrophage polarizationView study →}, and from Urtica dentata ^{12Reference 12Hou WR et al. · 2010Immunosuppressive constituents from Urtica dentata HandView study →}, among other plants.

Quantitative content is not well standardised — reported levels vary with species, plant part, provenance and season — so no reliable ”% dry weight” figure can be given across sources; this is tracked as a gap.

Discovery & Synthesis

Scoparone is a long-known simple coumarin whose name derives from Scotch broom (Cytisus scoparius, formerly Sarothamnus scoparius), an early botanical source; no single well-documented first-isolation report is readily verifiable, which is common for the older plant coumarins. Structurally it is the dimethyl ether of esculetin (6,7-dihydroxycoumarin), so it is straightforwardly accessible by O-methylation of esculetin — the reason “aesculetin dimethyl ether” is a standard synonym.

Modern chemistry treats scoparone as a scaffold for derivatisation: semi-synthetic 3-substituted analogues have been prepared and screened for improved anti-inflammatory activity, illustrating that the natural molecule is more often a lead than a finished drug ^{13Reference 13Kumar C et al. · 2024Scoparone chemical modification into semi-synthetic analogues featuring 3-substitution for their anti-inflammatory activityView study →}. Today scoparone reaches the lab as an isolated Artemisia constituent or by simple synthesis; there is no large-scale commercial-manufacture story to tell.

Patents: not yet researched.

Toxicity & Safety

Scoparone carries a low flag. Crucially, it is a simple coumarin, not a furanocoumarin — it lacks the furan ring — so it does not share the phototoxic and photocarcinogenic liability of psoralen-type furanocoumarins (bergapten, xanthotoxin, psoralen). Across the preclinical literature it is used at hepatoprotective doses without a prominent toxicity signal, and it has been proposed precisely as a protective agent ^{1,2Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 2Hanh NT et al. · 2026ReviewRecent advances in bioactive coumarin scoparone: A comprehensive reviewView study →}.

The honest limit is that human safety is uncharacterised: there are no clinical toxicology or drug-interaction studies of isolated scoparone, and its rapid conversion to scopoletin / isoscopoletin means whole-body exposure is not simply that of the parent ^{1,10Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 10Tian Q et al. · 2023AnimalComparative pharmacokinetics of scoparone and its metabolite scopoletin in normal and ANIT-induced intrahepatic cholestatic ratsView study →}. As a coumarin metabolised in the liver it is plausible — but unstudied — that it could interact with cytochrome-P450-dependent drug handling.

Safety at a Glance

✅ Low / no toxicity

• Not a furanocoumarin. No furan ring, so none of the phototoxic / photocarcinogenic risk of psoralen-type furanocoumarins.
• Favourable preclinical profile. Used at hepatoprotective doses in cell and animal models without a prominent toxicity signal; studied as a protective, not a toxic, agent.
• Human safety not characterised. No clinical toxicology, dosing or drug-interaction data for the isolated molecule.
• Metabolic and interaction unknowns. Rapidly converted to scopoletin / isoscopoletin; possible but unstudied interaction with hepatic CYP-mediated drug metabolism.

Dosage

There is no established human dose for scoparone. It is studied almost entirely in cell culture and animal models, where rodent doses commonly run from roughly 10 to 100 mg/kg ^{1,2,4Reference 1Hui Y et al. · 2020Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of actionView study →Reference 2Hanh NT et al. · 2026ReviewRecent advances in bioactive coumarin scoparone: A comprehensive reviewView study →Reference 4Wei M et al. · 2022The effects of scoparone on alcohol and high-fat diet-induced liver injury revealed by RNA sequencingView study →}. Human exposure is indirect — as one of several coumarins in yin chen hao preparations and other herbs — and the herb, not the isolated molecule, is what has a traditional use record.

These are doses used in research and are not a personal recommendation.

References

1. Hui Y, Wang X, Yu Z, et al. (2020). Scoparone as a therapeutic drug in liver diseases: Pharmacology, pharmacokinetics and molecular mechanisms of action. Pharmacological Research. https://pubmed.ncbi.nlm.nih.gov/32877694/
2. Hanh NT, Van CA, Son NT (2026). Recent advances in bioactive coumarin scoparone: A comprehensive review. Fitoterapia. https://pubmed.ncbi.nlm.nih.gov/41203139/
3. Cai Y, Zheng Q, Sun R, et al. (2020). Recent progress in the study of Artemisiae Scopariae Herba (Yin Chen), a promising medicinal herb for liver diseases. Biomedicine & Pharmacotherapy. https://pubmed.ncbi.nlm.nih.gov/32702631/
4. Wei M, Li T, Cao H, et al. (2022). The effects of scoparone on alcohol and high-fat diet-induced liver injury revealed by RNA sequencing. Biomedicine & Pharmacotherapy. https://pubmed.ncbi.nlm.nih.gov/36182737/
5. Meng Q, Zhu H, Li Y, et al. (2024). Quantitative proteomics reveals the protective effects of Yinchenzhufu decoction against cholestatic liver fibrosis in mice by inhibiting the PDGFRβ/PI3K/AKT pathway. Frontiers in Pharmacology. https://pubmed.ncbi.nlm.nih.gov/38469403/
6. Witaicenis A, Seito LN, da Silveira Chagas A, et al. (2014). Antioxidant and intestinal anti-inflammatory effects of plant-derived coumarin derivatives. Phytomedicine. https://pubmed.ncbi.nlm.nih.gov/24176844/
7. Yeh YT, Hsu KM, Chen HJ, et al. (2023). Identification of scoparone from Chinese olive fruit as a modulator of macrophage polarization. Journal of Agricultural and Food Chemistry. https://pubmed.ncbi.nlm.nih.gov/36947736/
8. Estrada-Soto S, González-Trujano ME, Rendón-Vallejo P, et al. (2021). Antihypertensive and vasorelaxant mode of action of the ethanol-soluble extract from Tagetes lucida Cav. aerial parts and its main bioactive metabolites. Journal of Ethnopharmacology. https://pubmed.ncbi.nlm.nih.gov/32961278/
9. Jung SH, Lee GB, Ryu Y, et al. (2019). Inhibitory effects of scoparone from chestnut inner shell on platelet-derived growth factor-BB-induced vascular smooth muscle cell migration and vascular neointima hyperplasia. Journal of the Science of Food and Agriculture. https://pubmed.ncbi.nlm.nih.gov/30861122/
10. Tian Q, Jin H, Huo X, et al. (2023). Comparative pharmacokinetics of scoparone and its metabolite scopoletin in normal and ANIT-induced intrahepatic cholestatic rats. Current Drug Metabolism. https://pubmed.ncbi.nlm.nih.gov/37165497/
11. Wang Y, Wang M, Chen B, Shi J (2017). Scoparone attenuates high glucose-induced extracellular matrix accumulation in rat mesangial cells. European Journal of Pharmacology. https://pubmed.ncbi.nlm.nih.gov/28970015/
12. Hou WR, Su ZQ, Pi HF, et al. (2010). Immunosuppressive constituents from Urtica dentata Hand. Journal of Asian Natural Products Research. https://pubmed.ncbi.nlm.nih.gov/20706909/
13. Kumar C, Chibber P, Painuli R, et al. (2024). Scoparone chemical modification into semi-synthetic analogues featuring 3-substitution for their anti-inflammatory activity. Molecular Diversity. https://pubmed.ncbi.nlm.nih.gov/37468705/

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