Clinical Study

Pharmacokinetics of Caffeine following a Single Administration of Coffee Enema versus Oral Coffee Consumption in Healthy Male Subjects

Figure 1

Chromatogram of plasma sample containing 4.00 μg/mL of internal standard (IS, retention time = 4.217 min) and 4.00 μg/mL of caffeine (retention time = 7.082 min).
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