Yes it has caffeine

I typically consume ~20-40mg caffeine per day in tea I'd guess. Today I'm trying a '5-hour Energy' drink with 230mg of caffeine. TLC confirms it does have tons of the stuff! So far:
- BP/HR spiked to 136/72 and 86bpm soon after drinking it
- Reaction time is worse (308ms peak, 290ms now vs a baseline below 270)
- Typing speed is worse, mostly due to extra errors (say, 15wpm penalty and I don't type particularly fast to start with)
- Beat Saber was interesting - I could maybe react faster, but also recovered worse from errors. Negative overall efffect imo (although it's hard to judge since any introspection distracts!)
- I'm not noticing any strong symptoms besides maybe a slight jitteriness.
(Experiment ongoing when I log this, TODO update)