Caffeine Articles & Guides

In-depth guides and tools to help you understand and master your relationship with caffeine.

Knowledge Tools for Caffeine

Caffeine in Drinks Database

Search our extensive database of over 1,000 beverages to find their exact caffeine content.

Caffeine Drink Comparison Tool

Visually compare the caffeine in coffee, tea, energy drinks, and more, side-by-side.

All Caffeine Articles

Caffeine Half-Life & Sleep

Understand the science of how long caffeine affects you.

Caffeine's Effect on REM Sleep

Learn how caffeine impacts your dreams and brain health.

Does Coke Zero Have Caffeine?

Get a clear answer on standard vs. caffeine-free versions.

Does Matcha Have Caffeine?

A guide to its caffeine content and unique effects vs. coffee.

Does Sprite Have Caffeine?

A clear answer and comparison to other popular sodas.

How Long Before Bed to Stop Caffeine

Find your personal caffeine curfew for better sleep.

How Long Does Caffeine Stay in Your System?

Understand the science of caffeine half-life and its impact on your body.

How Much Caffeine in a Shot of Espresso?

A guide to the caffeine in single vs. double shots and lattes.

How Much Caffeine in Celsius?

A guide to the high caffeine content in Celsius energy drinks.

How Much Caffeine Is in a Cup of Coffee?

The definitive guide to why caffeine levels vary so much in coffee.

How Much Caffeine Is in a Monster?

A guide to the caffeine in Monster Original, Zero Ultra, and Java Monster.

How Much Caffeine Is in Red Bull?

A complete guide to Red Bull's caffeine content and how it compares to other drinks.

How to Quit Caffeine Without Withdrawal

A step-by-step guide to tapering off caffeine.

What to Do When Caffeine Doesn’t Affect You

A science-backed guide to understanding and overcoming caffeine tolerance.

Why Does Caffeine Make Me Tired?

Learn the science behind the paradoxical caffeine crash.