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Caffeine Guides

In-depth, evidence-based articles on caffeine — what it is, how it affects your body, and how to use it safely. Written in plain English with sources from the FDA, USDA, ACOG, AAP, and peer-reviewed research.

6 sections

The Complete Caffeine Guide

What caffeine is, safe daily limits, half-life, sleep effects, benefits, and overdose symptoms — all in one master guide.

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Pregnancy

Caffeine and Pregnancy

How much caffeine is safe during each trimester, what ACOG recommends, and how caffeine affects fertility, miscarriage risk, and the developing baby.

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Mental health

Caffeine and Anxiety

Why caffeine triggers anxiety and panic, how it interacts with anxiety medications, and how to drink coffee if you have an anxiety disorder.

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Performance

Caffeine for Athletes

How to use caffeine to boost endurance, strength, and focus — including timing, dose, body-weight calculations, and NCAA/WADA rules.

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Caffeine Math

Free caffeine tools to help you drink smarter, sleep better, and stay under safe limits.

Tools

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  • Drink Comparison Tool
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  • Coffee Brew Ratio Calculator
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Guides

  • Complete Caffeine Guide
  • Caffeine & Pregnancy
  • Caffeine & Anxiety
  • Caffeine for Athletes
  • All Guides
  • FAQ

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Medical disclaimer: This site provides general information only and is not a substitute for professional medical advice. Always consult a healthcare provider about your individual caffeine tolerance, especially if you are pregnant, nursing, taking medication, or managing a health condition. Caffeine values are sourced from USDA FoodData Central, the FDA, and manufacturer-published nutrition labels, and may vary by 20% or more depending on brew strength, brand, and serving size.

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