Caffeine crystals

  • Annie Cavanagh and David McCarthy
  • Digital Images
  • Online

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Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

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Caffeine crystals. Annie Cavanagh and David McCarthy. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.

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False-coloured scanning electron micrograph of caffeine crystals. Caffeine is a bitter, crystalline xanthine alkaloid that acts as a stimulant drug. Beverages containing caffeine, such as coffee, tea, soft drinks, and energy drinks, enjoy great popularity, and 90% of adults consume caffeine daily.

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