- Caffeine Archive
 - Devoted to caffeine and those of us who imbibe, brew, relish, and just plain love it. - How Caffeine Works
- Explains how caffeine affects the body.
- Pro Plus
- From Roche Products. Relieves temporary tiredness.
- Vivarin (Caffeine)
- From GlaxoSmithKline. About vivarin, an over-the-counter caffeine tablet used to restore mental alertness or wakefulness when experiencing fatigue or drowsiness.
- Where is Caffeine Found?
- Lists the caffeine content in beverages, foods, and drugs. Includes a daily caffeine consumption quiz.
- Wikipedia: Caffeine
- Article about caffeine includes information on the history, effects, pharmacology, and extraction methods of pure caffeine.
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