Typical doses of caffeine are in the high tens to low hundreds of milligrams, which is much easier to measure than micrograms. A potentially lethal dose for a healthy adult is around 10 grams, about a hundred times as much as one would typically take.
There have been incidents of people dying from caffeine powder overdoses; a tablespoon or so is dangerous, but it’s easy for anyone who understands what a typical dose looks like to not do that. If it would fit in a pill capsule, it won’t kill a healthy, non-hypersensitive adult.
Typical doses of caffeine are in the high tens to low hundreds of milligrams, which is much easier to measure than micrograms. A potentially lethal dose for a healthy adult is around 10 grams, about a hundred times as much as one would typically take.
There have been incidents of people dying from caffeine powder overdoses; a tablespoon or so is dangerous, but it’s easy for anyone who understands what a typical dose looks like to not do that. If it would fit in a pill capsule, it won’t kill a healthy, non-hypersensitive adult.