What grain is the grain alcohol in Slenderiiz made from? Administrator August 14, 2017 18:11 The grain alcohol in Slenderiiz is made from potatoes. Related articles What if I need to cheat, what can I do without completely falling apart? Why is alcohol used in Slenderiix? Slenderiiz FAQs Children's Dosages Is Slenderiix recommended for a recovering alcoholic or someone who has went through an AA program? Comments 0 comments Please sign in to leave a comment.