Caffeine

Caffeine is one of the most widely consumed ergogenic aids globally, known for its ability to improve endurance, strength, and cognitive function during exercise. It works primarily by antagonizing adenosine receptors, which reduces feelings of fatigue and increases the release of neurotransmitters like dopamine and norepinephrine. In addition to central nervous system stimulation, caffeine increases the mobilization of fatty acids, sparing glycogen stores and enhancing endurance performance. It is available in various forms including powders, capsules, and beverages such as coffee and energy drinks. While generally safe in moderate doses, excessive intake can lead to side effects such as jitteriness and insomnia.

Caffeine blocks adenosine receptors in the brain, preventing the onset of drowsiness and increasing neuronal firing. This leads to increased release of excitatory neurotransmitters, enhancing alertness and reducing the perception of effort. Additionally, caffeine stimulates the release of adrenaline, promoting energy availability and fat metabolism.