Buckthorn Bark (Powder)
Buckthorn bark (Rhamnus frangula) is obtained from the bark of the buckthorn, a shrub or small tree native to Europe, Western Asia, and Northern Africa. Major compounds in Buckthorn bark powder consist of glycosides such as aloe emodin, emodinanthrone, chrysophanol-dianthrone and chrysophanolphys-ciondianthrone.1
Buckthorn bark may be useful for constipation and for the situations, where softening stool is beneficial, such as: hemorrhoids and post rectal-anal operations.2 It has been suggested in a preclinical study that aloe emodin found in Buckthorn bark powder may have anti-leukemic activity.3
van den Berg AJ, Labadie RP. Anthraquinones, Anthrones and Dianthrones in Callus Cultures of Rhamnus frangula and Rhamnus purshiana. Planta Med. 1984 Oct;50(5):449-51. PubMed PMID: 17340351
Buckthorn Bark. American Botanical Council. Expanded E. Accessed June 15, 2015. http://cms.herbalgram.org/expandedE/Buckthornbark.html
Kupchan SM, Karim A. Tumor inhibitors. 114. Aloe emodin: antileukemic principle isolated from Rhamnus frangula L. Lloydia. 1976 Jul-Aug;39(4):223-4. PubMed PMID: 957911.