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 Slenderiiz FAQs What if I need to cheat, what can I do without completely falling apart? Why is alcohol used in Slenderiix? What do I do if I hit a plateau? What should I do if I get a headache? Comments 0 comments Please sign in to leave a comment.