Reviewed: one independent reader; copy check clear.
caffeine
caffeine Caffeine is a naturally occurring methylxanthine found in certain plant seeds, nuts, and leaves.
Caffeine is a naturally occurring methylxanthine found in certain plant seeds, nuts, and leaves. In the central nervous system, it mainly blocks adenosine receptors, which reduces adenosine’s calming effect and increases brain activity; it also has anti-inflammatory effects.