Which stimulant is commonly found in coffee and has effect on reducing fatigue?

Caffeine is a central nervous system stimulant that is most commonly associated with coffee, tea, and various energy drinks. It works primarily by blocking adenosine receptors in the brain, leading to increased alertness and a reduction in the perception of fatigue. Adenosine is a neurotransmitter that promotes sleep and relaxation; when its effects are inhibited, the result is heightened wakefulness and a decrease in the sense of tiredness.

Through its action on neurotransmitters like dopamine and norepinephrine, caffeine can also enhance mood and cognitive function, making it a popular choice for those looking to stay awake and alert. While other substances mentioned may stimulate the body in different ways, they do not specifically reduce fatigue in the same manner as caffeine does.