Caffeine

Caffeine is the most commonly consumed psychoactive drug in the world. People regularly consume caffeine in coffee, tea, soft drinks and "energy" drinks. Caffeine is found in weight control products, sport supplements, and many over the counter products.

Caffeine, a member of the methylxanthine drug class, increases norepinephrine and epinephrine secretion.  It increases heart rate and basal metabolic rate, promotes secretion of acid in the stomach, acts as a diuretic, and acts as both a vasoconstrictor and vasodilator.

Subjectively, it provides a mental "lift" and enhances alertness. The half-life in adults is three to seven hours. Excessive caffeine consumption can also have side effects which includes heart palpations, anxiety, restlessness, delayed onset of sleep, and headache.  Natural sources of caffeine include coffee, tea, guarana, green tea, and yerba mate’.

How much caffeine?

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