caffeine

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caffeine molecule

Explore the health benefits of coffee consumption

How does caffeine affect the human body and brain?

Caffeine content of popular drinks.

A white woman bites into a chocolate bar.

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Cuban coffee served in the colonial city of Trinidad, Cuba

Why Does Too Much Caffeine Keep You Awake at Night?

Coffee beans after roasting.

How Is Coffee Decaffeinated?

tea. tea production. Camellia. Dried tea leaves in tea bag from tea plantation seeping in hot water in clear cup of tea. mug of tea. Camellia sinensis

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Opium. Opium poppy. Papaver somniferum. Seed. Spice. Poppy seed. Pile of poppy seeds.

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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

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Statue of Nostradamus

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Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

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Demystified - Do Lemmings Really Commit Mass Suicide? illustration

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Paul Revere. "The bloody massacre perpetrated in King Street Boston on March 5th 1770 by a party of the 29th Regt.," engraved by Paul Revere. Boston Massacre.

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caffeine: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Last Updated: Jun 13, 2025

News •

New hypothesis links caffeine to lower risk of sudden infant death syndrome • June 11, 2025, 5:17 PM ET (News-Medical)

Helping Save Kyiv From Drones: Volunteers, Caffeine and Vintage Guns • June 8, 2025, 9:07 AM ET (New York Times)

Facts

Also Known As	trimethylxanthine

Photos and Videos

caffeine molecule

Explore the health benefits of coffee consumption

How does caffeine affect the human body and brain?

A white woman bites into a chocolate bar.

See All Videos, Images and Interactives →

Topics

drug use tea coffee decaffeination cocoa bean mate What’s the Difference Between Coffee and Tea?energy drink kola nut guarana kratom Adderall antidepressant betel cocaine methamphetamine nicotine amphetamine khat theophylline

Demystified

Coffee beans after roasting.

How Is Coffee Decaffeinated?

Cuban coffee served in the colonial city of Trinidad, Cuba

Why Does Too Much Caffeine Keep You Awake at Night?