[drcharris]

Full details of caffeine amounts are here for those who are interested.

https://globalassets.starbucks.com/assets/94fbcc2ab1e2435985...

Recommended daily caffeine limit is usually quoted at around 400mg for an adult, although there's not a lot to back that number up.

[walrus01]

Wow, a venti is up to 340mg caffeine. Anecdotal sample size of one, anything more than 300mg in one serving crosses the threshold from 'super alert and productive' to 'jittery, nervous and feeling uncomfortable'.