How much caffeine is too much?
You may be drinking more than you think—and it could affect your health.
Jan, 2026
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Slide 1
About 85 percent of adults in the United States consume caffeine every day, mostly in the form of caffeinated coffee and tea. Some studies show that regular, moderate coffee consumption could help protect against stroke and dying from heart disease. But having too much caffeine can also lead to health issues.
Learn how much caffeine you may be consuming in beverages, foods, and medications, plus ways to get more energy, naturally.
Correction: A previous version of this slideshow stated that caffeine could help increase the effectiveness of aspirin and acetaminophen by 40 percent. It was updated in July 2025 to correct the overstatement and indicate it may increase effectiveness up to 40 percent.
Written byOlivia DeLong.
Medically reviewed byAnn Wendling, MD, MPH.
Sources: Walter K. Caffeine and Health. JAMA. 2022 Feb 15;327(7):693. + 17
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- U.S. Food & Drug Administration. Spilling the Beans: How Much Caffeine is Too Much? August 28, 2024.
- Zhang Y, Yang H, et al. Consumption of coffee and tea and risk of developing stroke, dementia, and poststroke dementia: A cohort study in the UK Biobank. PLoS Med. 2021 Nov 16;18(11):e1003830.
- Wang X, Ma H, et al. Coffee drinking timing and mortality in US adults. Eur Heart J. 2025 Feb 21;46(8):749-759.
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- University of Utah Department of Mathematics. Caffeine Content of Popular Drinks. Accessed July 21, 2025.
- Harvard TH Chan School of Public Health. The Nutrition Source: Caffeine. July 2020.
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- Drugs.com. Caffeine. June 20, 2025.
- Drugs.com. Does caffeine help migraines? April 10, 2025.
- Cleveland Clinic. How To Quit Caffeine Without a Headache. November 10, 2023.
- U.S. Department of Health and Human Services. Physical Activity Guidelines for Americans: 2nd Edition. December 2020.
- Mayo Clinic. Exercise: 7 benefits of regular physical activity. August 26, 2023.
- Mayo Clinic. Water: How much should you drink every day? October 12, 2022.
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