The sis go caffeine shot contains 150mg of caffeine 2g citrulline malate and b6 b9 b12 vitamins to help support the reduction of tiredness and fatigue before and during exercise benefits of the sis go caffeine shot 150mg when pushing yourself hard your brain controls how fatigued you feel caffeine acts as a stimulant on the brain to lower your perception of effort allowing you to keep pushing and maybe stretch yourself a little further it can take 30 60 minutes after