 Aloin

Aloin, also known as barbaloin, is a bitter, yellow-brown colored compound noted in the exudate of at least 68 "Aloe" species at levels from 0.1 to 6.6% of leaf dry weight (making between 3% and 35% of the total exudate), and in another 17 species at indeterminate levels [Reynolds, 1995b].It is used as a stimulant-laxative, treating constipation by inducing bowel movements.