Is 1000 mg of caffeine too much?

Online Answer
Extremely high daily intakes of 1,000 mg or more per day have been reported to cause nervousness, jitteriness and similar symptoms in most people, whereas even a moderate intake may lead to similar effects in caffeine-sensitive individuals (9, 10 ).
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Starbucks Canned Nitro Cold Brew contains 21.36 mg of caffeine per fl oz (72.24 mg per 100 ml). A 11 fl oz Can has a total of 235 mg of caffeine.
Caffeine occurs naturally in the tea plant, Camellia sinensis, so all brewed tea contains some caffeine. ... Cooler water and shorter steeping time extracts less caffeine—think green or white tea. Tea is the only plant that contains L-theanine, an amino acid that promotes calm and relaxation..
Caffeine begins to affect your body very quickly. It reaches a peak level in your blood within 30 to 60 minutes. It has a half-life of 3 to 5 hours..
The upper intake limit (%UL) of caffeine intake is 400mg for adults, and less than 85mg for kids. High caffeine foods and drinks include chocolate covered coffee beans, coffee, energy drinks, espresso, sodas, green tea, black tea, dark chocolate, coffee liqueur, and baked goods containing chocolate.
If caffeine is a big part of your daily diet, taking it away can have a host of unpleasant effects in the short term. These include headache, tiredness, sleepiness, down moods, trouble concentrating, and crankiness. You'll start to feel symptoms a day or two after you stop. They can last anywhere from 2 to 9 days.