caffeine

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Caffeine levels in the bloodstream usually peak between 30 minutes and two hours after drinking coffee.

From Science Daily • May 18, 2026

Caffeine blocks adenosine, a chemical that slows the activity of important brain messengers such as dopamine and acetylcholine.

From Science Daily • May 13, 2026

“It’s the caffeine in it. Caffeine, we are here. Caffeine puts a man on her horse and a woman in his grave,” writes Jake Barnes.

From Salon • Nov. 8, 2025

Caffeine has a time dilation on it so it could be hours that I’m in there or 30 minutes.

From Los Angeles Times • Aug. 21, 2025

A coffee bar is set off to the side, below a rustic-looking sign that says: Caffeine maintains my sunny personality.

From "The Sea in Winter" by Christine Day