Unless you are drinking more of it every day, there is probably nothing more than placebo by now. Anyway, caffeine works in vastly different ways. It blocks ad

Unless you are drinking more of it every day, there is probably nothing more than placebo by now. Anyway, caffeine works in vastly different ways. It blocks adenine receptors (which keeps your heart rate and blood pressure high), it does not flood the brain with neurotransmitters used in parts of the brain responsible for learning, retention and the reward system.