Compound Monograph
Nepodin
Nepodin (musizin) is a naphthalene derivative from the roots of dock species (Rumex). Its distinctive signal is preclinical antidiabetic activity via AMPK activation and GLUT4-mediated glucose uptake, alongside antimalarial (PfNDH2) and antifungal antibiofilm effects. All evidence is in-vitro and rodent — no human trials — and it is chemically and pharmacologically distinct from yellow dock's laxative anthraquinones and oxalates.
Sources · 4
Where Does It Come From?
Nepodin is a naturally occurring naphthalene derivative, found in Yellow Dock, Rumex japonicus, Rumex nepalensis and 1 other source. It is well tolerated orally (low toxicity).
Concentration
Content by Source
Concentrations not reported. No percent-dry-weight or mg/g figures have been published for this compound in its source plants.
Nepodin at a Glance
Nepodin (musizin) is a naphthalene derivative from the roots of dock species (Rumex).
Its distinctive signal is preclinical antidiabetic activity, working through AMPK activation and GLUT4-mediated glucose uptake — the same broad mechanism as metformin and berberine — alongside antimalarial activity.
What It's Used For
Nepodin (musizin) is the characteristic naphthalene derivative of dock (Rumex) roots — and the headline accuracy point is that it is not what makes yellow dock a laxative. Yellow dock’s stimulant-laxative and renal cautions belong to its anthraquinones (emodin, chrysophanol, physcion, rhein) and oxalates; nepodin is a structurally distinct 2-acetyl-1,8-dihydroxy-3-methylnaphthalene with no laxative role. Its own evidence is genuinely thin — three primary studies, one per signal — unified loosely by a mitochondrial/AMPK-axis theme. There are no human trials.
Support is an experimental score — weighted by study type (human > animal > in vitro) and volume. A beta, not a validated metric. Each signal rests on one primary study, so scores stay low by design.
Nepodin’s distinctive and most coherent signal: it activates AMPK in L6 myotubes and increases GLUT4 translocation to drive skeletal-muscle glucose uptake — acting as a direct AMPK/mitochondrial-function stimulator rather than through insulin secretion — and lowered fasting glucose and improved glucose tolerance in db/db mice 1Reference 1In vitroAntidiabetic effect of nepodin, a component of Rumex roots, and its modes of action in vitro and in vivoView study →.
Gap: a single primary study in one rodent model, isolated-constituent only, with no dose-response translation, no independent replication and no human data 1Reference 1In vitroAntidiabetic effect of nepodin, a component of Rumex roots, and its modes of action in vitro and in vivoView study →.
Nepodin isolated from Rumex crispus inhibited Plasmodium falciparum PfNDH2 (a parasite type-II NADH dehydrogenase) at low-µg/mL IC50 against chloroquine-sensitive and -resistant strains, with high parasitemia suppression in mice 2Reference 2Antimalarial activity of nepodin isolated from Rumex crispusView study → — mechanistically consistent with the mitochondrial/AMPK theme.
Gap: a single study with no follow-up and no selectivity/therapeutic-index characterization versus host mitochondrial enzymes, purely preclinical 2Reference 2Antimalarial activity of nepodin isolated from Rumex crispusView study →.
Nepodin (from Rumex japonicus) suppressed Candida albicans hyphal growth and biofilm — including dual-species biofilms — while sparing planktonic growth, an anti-virulence rather than biocidal profile 3Reference 3Inhibition of biofilm formation by Candida albicans and polymicrobial microorganisms by nepodin via hyphal-growth suppressionView study →.
Gap: R. japonicus material (a genus-level caveat), a single study, with no in-vivo confirmation and an anti-biofilm (not fungicidal) effect 3Reference 3Inhibition of biofilm formation by Candida albicans and polymicrobial microorganisms by nepodin via hyphal-growth suppressionView study →.
Mechanisms
| Target / pathway | Effect | Relevant to |
|---|---|---|
| AMPK (activation) | phosphorylates/activates AMPK in muscle cells | antidiabetic / metabolic |
| GLUT4 translocation | increased → skeletal-muscle glucose uptake | antidiabetic / metabolic |
| Mitochondrial function (skeletal muscle) | stimulated, consistent with AMPK engagement | antidiabetic / metabolic |
| PfNDH2 (parasite type-II NADH dehydrogenase) | inhibited → blocked mitochondrial electron transport | antimalarial |
| C. albicans hyphal transition / biofilm | suppressed; spares planktonic cells | antifungal / antibiofilm |
The recurring theme is mitochondrial/AMPK-axis modulation, which plausibly unifies the antidiabetic and antimalarial signals.
Pharmacokinetics
No dedicated pharmacokinetic study of nepodin exists. As a small lipophilic naphthalene derivative, its ADME is essentially uncharacterized — no human or animal absorption, metabolism or half-life data. The rodent efficacy studies establish only that systemic exposure sufficient for effect is achievable in mice 1,
Clinical trials
There are no human trials of isolated nepodin/musizin; all evidence is in-vitro and rodent. Any human exposure is incidental, via whole yellow-dock/Rumex preparations where nepodin is a minor constituent and the dominant pharmacology belongs to other molecules.
| Completed | Planned | Terminated | Preclinical |
|---|---|---|---|
| —(none, isolate) | — | — | Thin(one study per signal) |
Last checked: July 2026.
Toxicity & Safety
Nepodin’s low flag holds only at the levels actually studied — rodent work found no acute-toxicity signal, but no genotoxicity or chronic data exist to clear it properly, and yellow dock’s own laxative and oxalate cautions belong to different molecules entirely.
- No acute-toxicity signal in rodents. Mouse doses up to 250 mg/kg produced efficacy without a reported concern.
- Yellow dock’s cautions are not nepodin’s. The oxalate and renal load and the stimulant-laxative effect belong to the anthraquinones.
- Treat as contraindicated in pregnancy and lactation. No reproductive or developmental toxicology.
- No genotoxicity or chronic-toxicity data. The low rating means “at studied levels”, not an unqualified clean bill.
- Parent-class hazard doesn’t transfer, but isn’t fully excluded either. Unsubstituted naphthalene is hemolytic and carcinogenic; nepodin is a distinct, heavily oxygenated molecule.
Full Safety & Interactions Detail
Nepodin’s low flag applies at the levels studied, with an honest caveat. No dedicated toxicology exists; in the antimalarial study, mouse doses up to 250 mg/kg produced efficacy without a reported acute-toxicity signal 2Reference 2Antimalarial activity of nepodin isolated from Rumex crispusView study →, and the antidiabetic db/db study dosed without a flagged concern 1Reference 1In vitroAntidiabetic effect of nepodin, a component of Rumex roots, and its modes of action in vitro and in vivoView study →.
The parent-class hazard does not transfer automatically — unsubstituted naphthalene is hemolytic/carcinogenic, but nepodin is a heavily oxygenated, substituted naphthalene, a distinct molecule; still, there are no genotoxicity or chronic-toxicity data to affirmatively clear it, which is why the rating is low at studied levels rather than an unqualified clean bill. Critically, keep it distinct from yellow dock’s own cautions: the oxalate/renal load and anthraquinone stimulant-laxative effects are not nepodin’s and should not be imported in here.
Dosage
There is no established or safe human dose — nepodin is not sold or used as an isolated supplement and has no human dosing. Research doses are for context only: antimalarial mouse studies used ~10–250 mg/kg 2Reference 2Antimalarial activity of nepodin isolated from Rumex crispusView study →, the antidiabetic db/db study used effective oral dosing 1Reference 1In vitroAntidiabetic effect of nepodin, a component of Rumex roots, and its modes of action in vitro and in vivoView study →, and in-vitro antifungal/antimalarial effects fell in the sub-µg/mL to low-µg/mL range 2,
References
- Ha BG, et al. (2014). Antidiabetic effect of nepodin, a component of Rumex roots, and its modes of action in vitro and in vivo. BioFactors. https://pubmed.ncbi.nlm.nih.gov/24756979/
- Lee JH, et al. (2013). Antimalarial activity of nepodin isolated from Rumex crispus. Archives of Pharmacal Research. https://pubmed.ncbi.nlm.nih.gov/23440579/
- Lee JH, et al. (2019). Inhibition of biofilm formation by Candida albicans and polymicrobial microorganisms by nepodin via hyphal-growth suppression. ACS Infectious Diseases. https://pubmed.ncbi.nlm.nih.gov/31055910/
