Caffeine for strength and power: 200-400mg one hour before workouts

A stimulant and effective fat burner due to its ability to increase the release of fat from fat cells, caffeine has been shown to boost strength and power output when taken one hour before workouts. 

For fat loss and weight management: 100-200mg between meals; mental acuity and focus: 50-200mg every couple of hours; strength and power: 200-400mg one hour before workouts