How much caffeine is in Rejuveniix? Administrator September 06, 2017 19:35 There is 100 mg per serving of caffeine in Rejuveniix. Related articles General Product FAQs Is there nickel in any of the products? Rejuveniix Are any ARIIX products certified or proven to be "doping free"? November 2018 Quality Message (Puritii Air Filtration System) Comments 0 comments Please sign in to leave a comment.