What would you advise to a customer who wants Slenderiiz but he or she doesn't assimilate B vitamins? Administrator August 14, 2017 18:04 In this case, the customer could consider taking the Slenderiix and giving the Xceler8 to a friend. Related articles Slenderiiz FAQs Why am I constipated while on the Slenderiiz Program? What if I need to cheat, what can I do without completely falling apart? Why am I sleepless while taking Slenderiiz? Why aren’t bananas on the Slenderiiz Approved Foods List? Comments 0 comments Please sign in to leave a comment.