Although being a household name and drink, most people actually do not know the details of how this traditional drug can act as such a potent nootropic and psychostimulant. Caffeine is able to dissolve freely in water and is bioavailable with a fast onset of action. Passing the blood brain barrier with ease, cerebral levels of glutamate are raised and adenosine is reduced via caffeine’s ability to antagonise the adenosine receptor. Adenosine is important in promoting sleep, and inhibiting the brains activity. Further action on the brains rewards systems give caffeine the ability to boost motivation and lift mood.