Caffeine has been known to be one of the most widely consumed psychoactive substances all over the world. It is consumed from many drinking products such as coffee, tea, energy drinks, and soft drinks. Caffeine acts as a stimulant to increase alertness and arousal by blocking a neurotransmitter, adenosine. Adenosine plays an important role in regulation of blood flow and synaptic transmission of the brain activation of adenosine receptors (Davis, et al., 2003). Most people would consume this stimulant in order to keep the body awake and alert. Many would consider caffeine as a negative stimulant due to the side effects of anxiety, dizziness, insomnia, dehydration, jitteriness and faster heart rate due to the amount of caffeine consumed by the
