1: Wintola OA, Sunmonu TO, Afolayan AJ. The effect of Aloe ferox Mill. in the
treatment of loperamide-induced constipation in Wistar rats. BMC Gastroenterol.
2010 Aug 19;10:95. PubMed PMID: 20723249; PubMed Central PMCID: PMC2931457.


2: Yagi T, Yamauchi K, Kuwano S. The synergistic purgative action of aloe-emodin 
anthrone and rhein anthrone in mice: synergism in large intestinal propulsion and
water secretion. J Pharm Pharmacol. 1997 Jan;49(1):22-5. PubMed PMID: 9120764.