Emodin
1,3,8-trihydroxy-6-methylanthraquinone
TL;DR
Emodin is an anthraquinone from rhubarb and knotweed. It reliably stimulates bowel motility, which is why anthraquinone laxatives work, but the anti-cancer and metabolic claims come from cell and rodent studies. Long-term use raises genotoxicity and liver-injury concerns, so this is a short-term or food-level compound, not a daily supplement.
Ideal For
- People using a short course of a standardised rhubarb or cascara laxative under guidance
Avoid If
- You are pregnant or breastfeeding
- You have IBD or any bowel obstruction
- You have liver disease
- You want the in-vitro anti-cancer effects — they do not translate to oral dosing
Frequently Asked Questions
Overview
Emodin appears wherever anthraquinone laxatives do: rhubarb root, Japanese knotweed, cascara and senna relatives. Its established human-relevant effect is laxation — anthraquinones irritate colonic mucosa and increase peristalsis. Beyond that, emodin has become a favourite of in-vitro pharmacology, with papers on kinase inhibition, anti-inflammatory signalling and tumour cell apoptosis. Those effects occur at concentrations that oral dosing does not reproduce in people. Regulators have flagged anthraquinone genotoxicity, and case reports link chronic anthraquinone laxative use to melanosis coli and hepatotoxicity. If you take a knotweed or rhubarb extract, treat emodin content as a reason for caution rather than a selling point.
How It Works
- Stimulates colonic peristalsis and reduces water reabsorption (anthraquinone laxative effect)
- Inhibits casein kinase 2 and several tyrosine kinases in cell culture
- Modulates NF-kB inflammatory signalling in vitro
- Undergoes extensive glucuronidation, limiting free plasma concentrations
Benefits & Outcomes
No linked outcomes yet. Research is ongoing.
Supporting Research9 studies
The genus Rumex: review of traditional uses, phytochemistry and pharmacology
Vasas A, Orban-Gyapai O, Hohmann J
Rumex species contain anthraquinones (emodin, chrysophanol), flavonoids and tannins with laxative, antimicrobial, antioxidant and anti-inflammatory activity in preclinical models; no controlled human trials were identified.
Nano-emodin mediated photodynamic therapy for wound healing of donor site after free gingival graft: a parallel clinical trial
Yaghobee S, Pourhajibagher M, Bahrami R +1 more
The study employed a single-center, parallel, two-blind, randomized, controlled trial design. A total of 53 patients requiring FGG treatment were randomly assigned to one of three groups.
Emodin: A Review of Its Pharmacology, Toxicity and Pharmacokinetics
Dong X, Fu J, Yin X +4 more
Emodin demonstrates hepatotoxicity, nephrotoxicity and genotoxicity signals, with poor oral bioavailability.
Advances in the mechanism of emodin-induced hepatotoxicity
Wang Y, Zhao M, Li B +1 more
However, high doses and long-term use of emodin can also lead to liver toxicity. Nevertheless, the mechanism of emodin-induced liver toxicity remains unclear at present.
Recent Advances in the Therapeutic Potential of Emodin for Human Health
Sharifi-Rad J, Herrera-Bravo J, Kamiloglu S +3 more
Clinical translation is limited by low bioavailability and safety concerns.
Emodin, a rising star in the treatment of glycolipid metabolism disorders: a preclinical systematic review and meta-analysis
Xiao Y, Zhao Z, Chen B +2 more
Eight databases were searched from inception to May 2023. Two reviewers extracted the data independently. SYRCLE's risk of bias tool for animal studies was used to assess the quality of articles.
Emodin for pulmonary fibrosis: a systematic review and meta-analysis of efficacy and molecular mechanisms
Zhou X, Sima M, Fang Z +2 more
This systematic review and meta-analysis aimed to evaluate emodin's therapeutic efficacy in animal models of pulmonary fibrosis (PF) and summarize its anti-fibrotic mechanisms.
Emodin: a metabolite that exhibits anti-neoplastic activities by modulating multiple oncogenic targets
Tuli HS, Aggarwal V, Tuorkey M +2 more
One of these natural product metabolites, emodin has present with significant potential to target tumor oncogenic processes: induction of apoptosis and cell cycle arrest, tumor angiogenesis, and metastasis to chemoresistance in malignant cells.
A comprehensive review of emodin in fibrosis treatment
HaoShang, Jia X, Liu H +2 more
Moreover, the evidence of some studies is conflicting and confusing.
Safety Information
Potential Side Effects
Abdominal cramping, urgent loose stools, electrolyte loss with prolonged use, melanosis coli. Rare reports of hepatotoxicity with chronic anthraquinone exposure.
Contraindications
Pregnancy, breastfeeding, children, inflammatory bowel disease, bowel obstruction, and anyone with liver disease.
Drug Interactions
- Digoxin (potassium loss increases toxicity risk)
- Diuretics (additive electrolyte depletion)
- Warfarin (altered absorption and stool transit)
Pregnancy & Breastfeeding
Pregnancy: likely_unsafe
Breastfeeding: likely_unsafe
Dosage Guidelines
Dosage Used in Studies
Consult healthcare provider
Best Time to Take
Evening if used as a laxative constituent
Best Form
Standardised herbal preparation with a declared anthraquinone content, used short term
Bioavailability
Low free-fraction — heavily glucuronidated in gut wall and liver
Dosing by Goal
| Goal | Dose | Notes |
|---|---|---|
| Follow the product label; short courses only | Do not use anthraquinone laxatives for more than 1-2 weeks continuously | |
| Not recommended | No validated human dose; genotoxicity concerns |
Forms Compared
Usually sold for resveratrol; emodin is a co-constituent that can loosen stools
Traditional laxative preparation
Research chemical; not advisable as a consumer supplement
Food & Timing
Take with water; food does not prevent the laxative effect
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.