About Cascara Sagrada

Herbal supplement derived from the bark of the cascara tree, primarily used as a natural laxative to relieve constipation.

Effectiveness Scores

Constipation Relief: 4.0/10 (moderate evidence).
Despite user confidence and extensive traditional use. There's not a whole lot of evidence to support the claim. Now this doesn't mean cascara isn't effective for constipation, but something else. Something... dumber.
In 2002, the FDA withdrew its over-the-counter approval for constipation. The choice to do this was not based on effectiveness but on manufacturers failure to provide regulatory data. They essentially determined that study costs would exceed expected profits, causing them not to comply. This choice likely has an impact on why evidence is unsubstantial today.
With all that said, the few studies I could identify can be summed up with the following: "Systematic reviews consistently find no clinically important results from randomized controlled trials for chronic idiopathic constipation."
Why this rating: Minimal research has been conducted, and what has been done is unsubstantial.

Dosage & Timeline

Standard Dosages

Dried bark extract: 100-300 mg once daily
Raw bark: 1 g
Liquid extract: 2-6 mL
Liquid extract (alternative): 2-5 mL three times per day
Commercial capsules: 270 mg per serving (typical retail product)

Results Timeline

Onset: 6-12 hours (typical for most people)
- Range: Results usually occur 1-2 days after first dose, but may take 3-5 days

Not recommended for longer than 6 days

Safety Information

Pregnancy and breastfeeding: Cascara sagrada should be avoided during pregnancy and breastfeeding as it may stimulate uterine contractions, potentially leading to preterm labor. There is insufficient data regarding its safety during breastfeeding, so caution is advised.
Liver health: There have been reports of liver toxicity associated with the prolonged use of cascara sagrada. Individuals with liver conditions should avoid this supplement.
Chronic use and dependence: Prolonged use of cascara can cause the intestines to become reliant on the stimulant effect, leading to dependency, where the body becomes unable to move bowels without the use of laxatives. Therefore, it is recommended to use cascara only for short-term relief (1-2 weeks).
Kidney and electrolyte issues: Cascara can lead to potassium loss, which can cause muscle cramps, irregular heartbeats, and weakness. Individuals with kidney issues or those on medications that affect potassium levels should use cascara cautiously.
Dosing considerations: 270mg capsules for sensitive users, 450mg capsules as standard starting dose

Side Effects

Common side effects:

Abdominal cramps and discomfort

Diarrhea

Nausea

Dehydration due to loss of fluids from diarrhea

Rare side effects:

Electrolyte imbalances, particularly low potassium levels, due to excessive diarrhea

Risk of dependency with prolonged use

Liver toxicity in rare cases, particularly when used for long periods

Usage Information

Cascara sagrada is intended to relieve constipation by stimulating bowel movements, promote regularity, and support overall digestive health.

User Experience

Despite having several remedies for constipation, users prove to be remarkably loyal. One review I found stated, "I experimented with everything on the market, including Miralax, Senokot, Milk of Magnesia... Never once was I able to experience normalcy until Cascara Sagrada."

Many users report that cascara is effective at providing relief from constipation, often within 6–12 hours of use. Emphasis on the length of that timeline. It's not found to provide immediate relief, so be aware that it takes time to fully set in. But users consistently report superior effectiveness compared to MiraLax, Senokot, Dulcolax, fiber supplements, magnesium supplements, and dietary interventions.

Alternative Names

Frangula purshiana, Bitter bark, Bearberry

Cascara Sagrada