About Cascara Sagrada

Aged bark from a tree native to the Pacific Northwest. Used for generations as a natural laxative for occasional constipation.

Effectiveness Scores

Constipation Relief: 4.0/10 (moderate evidence).
Cascara bark contains compounds that your gut bacteria turn into active laxatives. They irritate the lining of your colon just enough to make its muscles push harder and to pull more water into your stool. It's the same basic way senna works, one of the most common drugstore laxatives.
Why this rating: Cascara very likely works as a short-term laxative, based on how it acts in the body and a long history of use. The problem is that almost nobody has tested it properly. In 2002, the FDA removed it from over-the-counter laxatives, not because it failed, but because manufacturers decided the required studies would cost more than the product would earn. That left over a century of use and very little modern data. Senna, its close cousin, has far stronger research behind it. This rating reflects how little cascara has been studied, not how poorly it works.

Understanding Effectiveness Scores

What does this mean?

Our effectiveness scoring system is based on scientific research and evidence. Each health outcome is rated on a scale of 1-10, with higher scores indicating stronger scientific support for the supplement's effectiveness.

1/10: Scientific evidence concludes that supplement is ineffective for purpose
2/10: No scientific evidence supports effectiveness
3/10: Inconclusive results regarding effectiveness
4/10: Minimal research on effectiveness
5/10: Limited evidence of effectiveness; may have potential benefits, but more research is needed
6/10: Some evidence supports the supplement's effectiveness, but research is mixed
7/10: Moderate evidence shows the supplement is effective for certain purposes, with limited population studies
8/10: Solid evidence suggests the supplement is effective, but research is not as extensive as higher levels
9/10: Strong scientific evidence supports the supplement's effectiveness, but some minor gaps in research remain (e.g., limited long-term studies or specific populations).
10/10: Ample scientific research demonstrates that the supplement is both highly effective and safe for long-term use.

Dosage & Timeline

Standard Dosages

Capsules (most common): 270 to 450 mg, once a day at bedtime
Dried bark extract: 100 to 300 mg, once a day
Liquid extract: 2 to 5 mL, once a day

Results Timeline

Usually 6 to 12 hours. Most people take it at bedtime, so it works by morning. If nothing happens after a day or two, don't keep raising the dose. Check with a doctor instead.

Not recommended for longer than 6 days

Safety Information

Only use aged bark: Fresh cascara bark is harsh enough to cause severe vomiting and cramping. The bark has to be dried and stored for at least a year, or heat-treated, before it's safe. Commercial products are made from aged bark.
Pregnancy and breastfeeding: Avoid. Cascara may trigger uterine contractions, and there isn't enough safety data for breastfeeding.
Liver health: Avoid if you have a liver condition. A small number of liver injury cases have been reported with long-term use.
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.
Who should not use it:
- Children under 12
- Anyone with a bowel blockage, appendicitis, or unexplained stomach pain
- Anyone with Crohn's disease or ulcerative colitis

Side Effects

Common side effects:

Stomach cramps and discomfort
Diarrhea
Nausea
Dehydration from fluid loss

Rare side effects:

Low potassium from too much diarrhea, which can cause muscle cramps, weakness, or an irregular heartbeat
Dependence, when your bowels stop moving well without a laxative
Liver injury, reported in a small number of cases with long-term use
Melanosis coli, a harmless dark staining of the colon lining that shows up with long-term use and fades after stopping

Usage Information

People take cascara sagrada for occasional constipation. It's a stimulant laxative, meaning it works by making your bowels move rather than by adding fiber or softening stool.

It's meant for short-term use only. Constipation that lasts more than a week or keeps coming back is worth talking to a doctor about.

User Experience

Gathered from reviews and forum posts, not from studies. What people report tells you what to expect. It does not tell you whether something works.

Users are remarkably loyal to Cascara. One reviewer wrote, "I experimented with everything on the market, including Miralax, Senokot, Milk of Magnesia... Never once was I able to experience normalcy until Cascara Sagrada."

Most people say it works within 6 to 12 hours. It isn't instant, so plan around that. Many users say it works better for them than MiraLax, Senokot, Dulcolax, fiber, magnesium, or diet changes.

Alternative Names

Frangula purshiana, Bitter bark

Cascara Sagrada