Caffeine functions by blocking adenosine, a chemical that signals sleepiness to the brain

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High-dose caffeine administration antagonizes adenosine receptors to transiently restore physical vigor and elevate mood during severe endurance fatigue

The combination of L-theanine and caffeine outperforms caffeine alone on measures of cognitive performance like working memory and accuracy

Blocking adenosine with caffeine keeps the brain alert and increases norepinephrine and dopamine signaling

Research indicates that caffeine consumed even 8-12 hours before bed disrupts the architecture and depth of sleep

Caffeine can improve focus and concentration, with a generally useful dosage range of 100 to 400 milligrams

For most people, ingesting 100-200 milligrams of caffeine before a focused work session is effective

ADHD medications such as Adderall, Ritalin, and Vyvanse work by increasing dopamine and epinephrine transmission in the brain

Stimulants like Ritalin can paradoxically help a child with severe ADHD to focus better, rather than making them more hyperactive

For a regular user, daily caffeine consumption primarily counteracts withdrawal symptoms to return to a functional baseline

Quitting caffeine cold turkey can cause withdrawal symptoms including flu-like feelings and an inability to focus

Consuming up to seven or eight cups of coffee per day is associated with positive health effects

Studies have shown that students who consume caffeine perform better on academic tests

Caffeine increases the rate of ketone formation, which provides an alternative fuel for neurons

Caffeine consumed at noon can still be present in the body's system at midnight.

Regular ingestion of 100-250mg of caffeine can increase the number of D2 and D3 dopamine receptors.

Drinking caffeine within eight to ten hours of bedtime disrupts sleep.