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Caffeine, mighty caffeine. CNS(central nervous system) and metabolic stimulant, nootropic, and the world's most widely used psychoactive compound. It makes us feel great, but why?
Its main mechanism of action is the blocking of Adenosine, a nucleoside with a generally sedating and relaxing effect, the absence of which results in an added alertness and vigilance, which also can be attributed to its modulating effect on adrenaline/noradrenaline levels, as well as most other prime neurotransmissions.
Aside from its well-known mental effects regarding concentration and focus, larger doses(400mg+) have been seen to noticeably improve physical strength and endurance.
(Optimal dosage is 1 cap per 150lbs/70kg)