Guarana is a genuine, distinct caffeine source from Green Tea in this formula — worth understanding what "slow-release" actually means here.
Guarana Seed Extract is an Amazonian plant rich in slow-release caffeine, traditionally used to support steady energy and help combat everyday fatigue rather than a fast spike.
"Slow-release" describes the release pattern, not the absence of caffeine — combined with Green Tea's caffeine, this formula has two real caffeine sources worth being aware of.