Cascara sagrada tea is made by steeping small pieces of dried, aged bark in hot water for 10 to 15 minutes. The bark comes from the cascara sagrada tree (also called California buckthorn), and it has been used for centuries as a natural laxative. Making the tea itself is straightforward, but there are important details about sourcing, dosing, and safety that determine whether the tea works as intended or causes problems.
Why the Bark Must Be Aged First
You cannot use fresh cascara sagrada bark. Fresh bark contains compounds that cause vomiting rather than the intended laxative effect. After harvesting, the bark is cut into small pieces and dried for a full year before it’s safe to use. This aging process transforms the chemistry of the bark so it works on the lower digestive tract rather than triggering nausea. If you’re buying cascara sagrada bark from an herb shop or online retailer, it should already be properly aged and dried. Whole bark pieces, cut-and-sifted bark, and powdered bark are all available.
Brewing the Tea
The typical medicinal dose of cascara sagrada is about 300 mg of dried bark, which is roughly one teaspoon of cut-and-sifted bark. Place the bark in a mug or small teapot, then pour about 8 ounces of hot water over it. The water should be just off the boil, around 200 to 208°F. Let it steep for 10 to 15 minutes. Bark is denser than leaf tea, so it needs more time to release its active compounds. Strain the pieces out before drinking.
The resulting tea is bitter. This is normal and a sign that the active compounds have extracted into the water. Many people add honey, lemon, or ginger to make it more drinkable. You can also blend it with a small amount of peppermint or licorice root, both of which complement the flavor and may ease any stomach discomfort.
If you’re using powdered bark instead of cut pieces, reduce the steeping time to about 5 minutes and strain through a fine mesh strainer or cheesecloth to filter out sediment.
How It Works as a Laxative
The active compounds in cascara sagrada bark are called cascarosides. These stimulate the muscles of the large intestine, increasing contractions and motility to produce a laxative effect. Another compound in the bark, emodin, acts directly on the smooth muscle cells lining the colon. Together, these compounds push waste through more quickly and draw water into the intestines to soften stool.
The effect typically kicks in 6 to 12 hours after drinking the tea, which is why many people take it before bed and expect results the following morning. One cup per day is the standard approach, and you should not exceed that.
How Long You Can Safely Use It
Cascara sagrada is strictly a short-term remedy. It is not recommended for use longer than six consecutive days. Exceeding that window, or taking more than the recommended dose, raises the risk of liver toxicity, cramping, and dependence.
Chronic use of stimulant laxatives like cascara sagrada can lead to a condition called melanosis coli, where the lining of the colon develops a dark pigmentation. Published case reports show this can develop in as few as four months of regular use. One case involved a patient who drank an herbal laxative tea daily for four months and developed persistent diarrhea along with biopsy-confirmed melanosis coli. While melanosis coli itself is generally reversible once laxative use stops, the pattern of dependence and electrolyte loss that comes with chronic use is harder to undo.
Long-term overuse can also cause what’s sometimes called “cathartic colon,” where the intestinal muscles lose their ability to contract normally without stimulation. This creates a cycle where you need the laxative just to have a bowel movement at all.
Regulatory Status in the U.S.
In 2002, the FDA reclassified cascara sagrada as “not generally recognized as safe and effective” for use in over-the-counter laxative drug products. This happened because no one submitted the carcinogenicity data the agency requested. The ruling means cascara sagrada can no longer be marketed as an OTC laxative drug. However, it is still legally sold as a dietary supplement and as loose dried bark. The distinction matters: as a supplement, it doesn’t go through the same safety review process that OTC drugs do, and manufacturers aren’t required to prove it works.
Who Should Avoid It
Cascara sagrada is not appropriate for pregnant or breastfeeding women, children, or anyone with inflammatory bowel conditions like Crohn’s disease or ulcerative colitis. People with abdominal pain, nausea, or vomiting of unknown origin should also avoid it, since stimulant laxatives can worsen conditions like bowel obstruction. If you take prescription medications, be aware that cascara sagrada can speed transit time enough to reduce absorption of other drugs, and it can lower potassium levels, which is particularly risky if you take heart medications or diuretics.
If constipation persists beyond a week, the underlying cause needs attention rather than continued stimulant laxative use. Cascara sagrada tea is a short-term tool, not a long-term solution.