Caffeine: The Double-Espresso Standard

Caffeine comes in many forms.

Brass tacks: let’s all face it, caffeine is a drug. It is legal, but it functions in your body in the same way as a drug. The half-life averages five hours. But the hit only lasts around two. Afterward, the body has processed almost half of it and the effect is tapering off and quickly leaves the “useful” level zone in your metabolism. So the boost from your 8 am zip juice doesn’t last until lunch. So even though the caffeine is still in your system for the next 3 hours you need another hit.

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