Earlier quoted context omitted.
For whatever it’s worth, in response to the same question posed by me (“what is the ld50 of caffeine”), Google’s AI properly reported it as 150-200 mg/kg. I asked this about 1 minute after you posted your comment. Perhaps it learned of and corrected its mistake in that short span of time, perhaps it reports differently on every occasion, or perhaps it thought you were a rat :)
The median lethal dose (LD50) of caffeine in humans is estimated to be 150–200 milligrams per kilogram of body mass. However, the lethal dose can vary depending on a person's sensitivity to caffeine, and can be as low as 57 milligrams per kilogram. Route of administration Oral 367.7 mg/kg bw Dermal >2000 mg/kg bw Inhalation LC50 combined: ca. 4.94 mg/L ref: https://i.imghippo.com/files/yeKK3113pE.png 13:25EST (by a K…
That’s half the people in a caffeine chugging contest falling over dead. The first 911 call would be much much earlier. I doubt you’d get to 57 mg before someone thought they were having a heart attack (angina).