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https://www.webmd.com/diet/how-long-caffeine-lasts
You notice the effects of caffeine within 15 minutes. The levels in your bloodstream peak an hour later and remain there for several hours. About 6 hours after you consume caffeine, half of it is...
https://www.healthline.com/health/how-long-does-caffeine-last
Jun 22, 2017 · These symptoms may include: headache (the most common symptom) depression anxiety drowsiness and fatigueAuthor: Kristeen Cherney
https://my.clevelandclinic.org/health/articles/15496-caffeine-how-to-hack-it-and-how-to-quit-it
The effects of caffeine can be felt as soon as 15 minutes after it is consumed. The level of caffeine in your blood peaks about one hour later and stays at this level for several hours for most people. Six hours after caffeine is consumed, half of it is still in your body.
https://pubmed.ncbi.nlm.nih.gov/24235903/
The magnitude of reduction in total sleep time suggests that caffeine taken 6 hours before bedtime has important disruptive effects on sleep and provides empirical support for sleep hygiene recommendations to refrain from substantial caffeine use for a minimum of 6 hours prior to bedtime.Cited by: 278
https://www.ncbi.nlm.nih.gov/books/NBK223808/
Ingestion of caffeine in doses up to 10 g has caused convulsions and vomiting with complete recovery in 6 hours (Dreisbach, 1974). Extreme side effects were observed in humans at caffeine intakes of 1 g (15 mg/kg) (Gilman et al., 1990), including restlessness, nervousness, and irritability, and progressing to delirium, emesis, neuromuscular tremors, and convulsions.
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