Caffeine acts as a central nervous system stimulant. Once consumed, it gets absorbed into the bloodstream and travels to the brain. There, it blocks the effects of adenosine, a neurotransmitter that promotes relaxation and sleepiness. This blockage is what leads to the alertness and focus associated with caffeine consumption.

Caffeine supplements offer several benefits: They boost alertness and focus by blocking adenosine, helping combat fatigue and improve concentration. They enhance physical performance by increasing energy levels, delaying fatigue and improving muscle function. Caffeine supplements may elevate mood and reduce symptoms of depression with moderate intake, and could also improve memory, reaction time and overall cognitive function.

The best sources of caffeine are coffee, black and green tea, and supplements. Whether it's brewed, espresso or instant, coffee offers a convenient and flavourful way to get your caffeine fix. Both black and green tea also contain caffeine, making them excellent alternatives to coffee. Caffeine supplements are convenient if you want a precise amount of caffeine without the hassle of brewing beverages, and are often used by athletes or individuals looking to enhance focus and energy levels without additional calories or additives.