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The lethal dose of caffeine for most people, says Temple, is about 10 grams, although this varies from person to person. A cup of coffee has around 100 to 200 milligrams of caffeine. An...
A lethal dose of caffeine is about 5 to 10 grams (5,000 to 10,000 mg) or 150 to 200 mg per kilogram of body weight. Sub-lethal caffeine overdose may cause symptoms such as chills, flushing, headache , nausea , heart palpitations, and tremors.
A lethal dose is based on the LD50 for caffeine and the amount of caffeine that must be in your system at one time. Consuming too much caffeine? Need help reducing caffeine (or quitting entirely)? Take the Overcoming Caffeine Withdrawal course. Use Wean Caffeine (something we helped get to market).
Some have indicated that after a dose of around 1 g, toxic symptoms begin to manifest, a dose of 2 g requires hospitalization, while higher doses (e.g., typically 5 g or more) could be lethal [27,28,31].
A concentration of 80 to 100 mg/L can be fatal. Caffeine overdose is most likely to result from taking a dietary supplement or caffeine tablets rather than from drinking coffee,...
Caffeine in powder or liquid form can provide toxic levels of caffeine, the U.S. Food and Drug Administration has cautioned. Just one teaspoon of powdered caffeine is equivalent to about 28 cups of coffee. Such high levels of caffeine can cause serious health problems and possibly death.
Lethal doses of caffeine have been reported at blood concentrations of 80 to 100 micrograms/ml, which can be reached with ingestion of approximately 10 grams or greater.