Barbaloin (aloin A) is a C-glycosyl anthrone found in the latex of Aloe vera and related species. It functions as a stimulant laxative by promoting intestinal peristalsis and water secretion. The compound is a beta-D-glucopyranoside derivative of aloe-emodin anthrone and contributes to the bitter taste of aloe preparations. Historically used in herbal medicine, its use is now restricted in many regions due to potential genotoxicity and carcinogenicity concerns associated with anthraquinones. It exhibits yellow coloration in solution and decomposes upon heating.