Supplement analysis backed by scientific evidence · PT

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Moderate evidenceGut health

Cascara Sagrada

Cascara sagrada is a genuine stimulant laxative — its anthraquinone cascarosides reliably produce a bowel movement in 6-12 hours. It is also the reason regulators have been tightening the screws on anthranoid laxatives: the FDA pulled it from OTC drug status in 2002, and the EU has restricted hydroxyanthracene derivatives in supplements over genotoxicity concerns.

What the science says

  • Produces a bowel movement as a stimulant laxative Moderate evidence

    Cascarosides are hydrolyzed by colonic bacteria to active anthrones that stimulate colonic motility and inhibit water/electrolyte reabsorption, typically producing evacuation 6-12 hours after an evening dose. Its laxative efficacy has never been seriously disputed; the pharmacology is the same class as senna.

  • Safe for regular or long-term use Limited evidence

    Regulators disagree. In 2002 the FDA concluded that cascara sagrada was not generally recognized as safe and effective for OTC laxative use and removed it from OTC drug products, leaving it on the market only as a dietary supplement. The EU has since restricted preparations containing hydroxyanthracene derivatives from Rhamnus, Cassia and Rheum species in food supplements after EFSA judged these compounds genotoxic.

  • Causes "cathartic colon" and colorectal cancer Limited evidence

    Chronic anthranoid use reliably produces melanosis coli, a benign, reversible dark pigmentation of the colonic mucosa. The stronger claims are less certain: reviews of anthranoid laxatives find in vitro genotoxicity and some case-control signals for adenomas, but no convincing causal evidence of colorectal cancer in humans, and the classic "cathartic colon" from long-term use appears to be rarer than once believed.

  • Detoxifies or aids weight loss Limited evidence

    There is no evidence cascara removes toxins, and any weight change is stool and water that returns within a day. Laxative use for weight control is a recognized feature of disordered eating and carries real risk of hypokalemia and dehydration.

Dosage & safety

Studied dosePharmacopoeial dosing is 20-30 mg hydroxyanthracene derivatives (calculated as cascaroside A) per day, taken at night, for no longer than 1-2 weeks without medical supervision. Supplement capsules of crude bark are commonly 400-500 mg and are usually not standardized, so actual anthraquinone content varies widely between products. Bark must be aged at least a year before use — fresh bark causes severe vomiting and cramping.
SafetyExpect cramping and urgency. Prolonged use causes potassium loss, which is dangerous with digoxin, diuretics, or corticosteroids and can trigger arrhythmias. A published case documents cascara sagrada-induced cholestatic hepatitis severe enough to cause portal hypertension. Contraindicated in bowel obstruction, appendicitis, acute inflammatory bowel disease, undiagnosed abdominal pain, in children under 12, and in pregnancy and breastfeeding (anthranoids pass into milk). Do not use daily as a maintenance laxative — osmotic agents such as PEG 3350, or fiber such as psyllium, are the evidence-based first line for chronic constipation.

Scientific references

Where to buy

Dr. Mercola, Cascara Sagrada, 90 Capsules (308 mg per Capsule)

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