Rhamnus purshiana is also known as Bitter Bark and Sacred Bark, but more commonly known as Cascara sagrada. Its first known use was by the Native Americans as a laxative. 

Cascara sagrada comes from a tree native to North America that can grow in height up to 50 feet tall. The tree prefers a moist to wet climate and soil, but can survive dry weather in the summer months. It has small green-white flowers that bloom in the spring, with green leaves that turn yellow to orange to red in autumn. It produces a purple fruit that birds enjoy. The bark of the tree is the most desired form, and is prepared in liquid, tea, tincture, capsules, and tablets. It is used either by itself, or with supporting nutrients in a formulated blend.

Cascara sagrada has a long history of successful use. Experts report: “Cascara is used to treat constipation. The usual dose is 300 mg taken 1 time a day. It is not advised to take cascara at a higher dose or for longer than 6 days. When taken by mouth, it has these effects: Acts as a laxative or purgative to loosen and increase bowel movements and empties the colon.” 

Cascara sagrada contains anthraquinone glycosides that stimulate the bowel, giving it a cathartic or laxative effect. Although laxatives in general can be quite effective when needed, they should be used properly for limited, short-term use, so as not to lead to dependency or other health problems. Cascara has its place, and there are times when it can be very effective, but we need to keep our focus on making healthier choices. Adding dietary fiber to the diet, drinking plenty of water, keeping an active lifestyle, and eating a healthy, and well-balanced diet is key.

Cascara sagrada may trigger side effects, including stomach discomfort, cramps, dehydration, lowering electrolyte balance, and muscle weakness. Although effective, Cascara sagrada should be avoided without support or advice from a medical practitioner, especially for children and those who are pregnant or breastfeeding.

References:

Johns Hopkins Health Library, Cascara Sagrada- Rhamnus Purshiana. Online Medical Reviewer: Bianca Garilli MD; Online Medical Reviewer: Chris Southard RN; Online Medical Reviewer: Stacey Wojcik MBA BSN RN; Date Last Reviewed: 8/1/2023