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Most kids do best with no caffeine, and teens who do have it should keep daily intake near 100 mg.

Most breastfeeding parents do fine at 200–300 mg caffeine a day, then scale back if baby gets fussy or sleep gets choppy.

Most healthy adults do fine at up to 400 mg caffeine daily; pregnancy limits are lower.

Most healthy adults do fine with up to 400 mg of caffeine per day, spread out, while pregnancy and some conditions call for less.

Most pregnant adults should stay at or under 200 mg of caffeine per day, unless their care team sets a lower cap.

Most healthy adults do well staying near 400 mg of caffeine per day, and pregnancy limits are commonly set near 200 mg.

Most healthy adults can handle up to 400 mg of caffeine a day, while pregnancy guidance usually caps daily intake at 200 mg.

Most teens do best staying at or below 100 mg of caffeine a day, with lower targets for smaller bodies and anyone who feels jittery or sleeps poorly.

Caffeine alone seldom triggers a heart attack; the scare comes from massive doses, stimulant mixes, or blocked arteries.

Most teens do best at 100 mg of caffeine a day or less, with an earlier cutoff time to protect sleep.