How much caffeine is in Rejuveniix? Administrator September 20, 2021 20:23 Updated There is 100 mg per serving of caffeine in Rejuveniix. Related articles Rejuveniix 4-Week Rolling Calendar Can Rejuveniix help with my addiction to energy drinks? Can I drink alcohol and also take Rejuveniix? Can I become addicted to Rejuveniix? Comments 0 comments Please sign in to leave a comment.