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Also contributing to caffeine content are growing conditions, processing techniques, and other variables. Thus, teas contain varying amounts of caffeine. [243] Tea contains small amounts of theobromine and slightly higher levels of theophylline than coffee. Preparation and many other factors have a significant impact on tea, and color is a poor ...
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(Original text) : 3D-model of a caffeine molecule. Created by Michael Ströck (mstroeck) on date of upload and released under the GFDL. 17:36, 9 December 2011: 945 × 800 (70 KB) Ronhjones (Original text) : 3D model of caffeine molecule. Created my Michael Ströck (mstroeck) on January 31, 2006. Released under the GFDL. 17:36, 9 December 2011
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In rats, d9-caffeine freely crosses the blood-brain barrier. [3] In single-dose comparisons in humans, d9-caffeine exhibited a 29%–43% higher C max and 4-5-fold higher total exposure than caffeine, and a 5-10-fold reduction in the relative exposure to the active metabolites of caffeine such as paraxanthine, theobromine, and theophylline. [4]
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