How to Use caffeine in a Sentence

caffeine

noun
  • Her doctor told her to avoid caffeine.
  • Too much caffeine is bad for your skin and your health.
    — Laura Schober, Health, 10 Sep. 2025
  • Then, of course, there's caffeine.
    — Jeff Wagner, CBS News, 15 Apr. 2026
  • Black tea and matcha tend to have more caffeine than green tea.
    — Ashley Olivine, Verywell Health, 5 Jan. 2026
  • The caffeine in this eye cream did not take long to get to work.
    — Tamim Alnuweiri, InStyle, 23 May 2026
  • Add a shot of espresso to add a caffeine boost.
    — Joseph Erbentraut, Better Homes & Gardens, 5 Apr. 2026
  • Some sodas are a source of caffeine as well.
    — Dr. Mark Corkins, Boston Herald, 14 Sep. 2025
  • So caffeine can make the pain feel less severe.
    — Dan England, Outside, 5 Feb. 2026
  • The lack of sugar and caffeine hit me like a ton of bricks.
    — Julia Gomez, USA Today, 29 Oct. 2025
  • Tea bags can release caffeine faster than loose tea.
    — Brandi Jones, Health, 6 Feb. 2026
  • That's a lot of caffeine to pump into an adult, let alone a kid.
    — Sarah Cottrell, Parents, 11 July 2023
  • As the adage goes, with great matchups comes great caffeine intake.
    — Steven Louis Goldstein, New York Times, 28 Oct. 2025
  • There’s also a slight kick of caffeine, which helps with jet lag.
    — Katie Jackson, Travel + Leisure, 31 Jan. 2026
  • There’s also a slight kick of caffeine, which helps with jet lag.
    — Katie Jackson, Travel + Leisure, 23 Dec. 2025
  • Try to avoid taking iron with milk, high fiber foods, or caffeine.
    — Kirstyn Hill, Health, 26 Jan. 2026
  • Espresso has the most caffeine per ounce.
    — Brandi Jones, Health, 6 Feb. 2026
  • Even those who stay away from caffeine are able to indulge in this tasty treat.
    — Ebony Williams, ajc, 6 May 2022
  • Your caffeine intake is too late.
    — Korin Miller, SELF, 12 Jan. 2026
  • That means that five hours later, half of the caffeine is still in your body.
    — Laurie Hertzel, Star Tribune, 3 May 2021
  • The whole look was just about as downtown-cool as a caffeine run fit can get.
    — Christian Allaire, Vogue, 26 Jan. 2021
  • Coffee here isn’t a caffeine hit.
    — John Noakes, Hartford Courant, 31 Jan. 2026
  • Not to mention, any would make a great gift for the caffeine fiend in your life.
    — Chelsea Stone, CNN Underscored, 15 Dec. 2020
  • While caffeine has been shown to help treat headaches, it’s also been shown to cause them.
    — Emily Brown, Verywell Health, 24 Sep. 2025
  • The takeaway from the research is not that caffeine is bad.
    — Samantha Agate, Miami Herald, 6 May 2026
  • My blood was full of nicotine and caffeine and my mind was just sort of filled with these ideas.
    — Lindsey Bahr, Star Tribune, 15 Jan. 2021
  • Green coffee extract in the drink gives you a bold boost of caffeine.
    — Emily Vanschmus, Better Homes & Gardens, 4 Aug. 2022
  • But this bikini queen isn't a fan of ye olde morning caffeine fix.
    — Emily Shiffer, Women's Health, 8 Mar. 2023
  • True coffee lovers sometimes need a caffeine boost on the go.
    — Cnn Underscored Staff, CNN Underscored, 17 Nov. 2020
  • The general rule is that caffeine has a half-life of about six hours.
    — Johanna Gretschel, SELF, 4 Feb. 2022
  • Too much caffeine can put a strain on your immune system.
    — Julie Marks, Verywell Health, 6 Jan. 2026

Some of these examples are programmatically compiled from various online sources to illustrate current usage of the word 'caffeine.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Last Updated: