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Caffeine crystals

Annie Cavanagh


Free to use with attribution for non-commercial purposes CC BY-NCCredit: Annie Cavanagh and David McCarthy
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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. Wellcome Image Awards 2012.



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Caffeine crystals. Credit: Annie Cavanagh and David McCarthy. CC BY-NC

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