Caffeine stimulates the central nervous system to temporarily warding off drowsiness and restoring alertness. In contrast, Fatigue Reviva is a unique blend of amino acids, vitamins and minerals that instantly absorbs into blood stream bypassing the digestive system resulting in a boost in physical and mental potential. On top of it, FATIGUE Reviva also may assist with the relief of symptoms, which may be caused by exhaustion such as cramps, anxiety, tiredness, muscle pain, spasms, stress and sleep disturbances. On the other hand, an excess caffeine intake may lead to chronic insomnia, persistent anxiety, increase heart palpitations, caffeine withdrawal syndrome when not drinking it, and also restlessness.