Tag: Upper

As the world's most widely consumed psychoactive substance, caffeine is indeed a central nervous system (CNS) stimulant, colloquially known as an "upper". It provides a boost in alertness and reduces fatigue by affecting brain activity and neurotransmitter function. However, its effects are milder compared to illicit stimulants.

Globally, caffeine is the most widely consumed psychoactive substance, with approximately 80% of U.S. adults consuming it regularly. However, the classification of caffeine as an “upper” is more nuanced than a simple yes or no, as it functions distinctly from more potent central nervous system (CNS) stimulants. This article delves into how caffeine operates within the body to produce its well-known stimulating effects and clarifies its relationship to other, more powerful uppers.