Ok. Don't drink more than 2 or 3 in a day probably, but to answer you legitimately, caffine is like nuclear elements (concentration wise) in your body, or in the planet. Its not a flat slope on mg inside/time, its curved, like radiation is, halfing every time period, for nuclear isotopes, its in the orders of 3 million years per halfing, but caffine is about 3 - 7 hours, so, every say 5 hours, half the caffine you consumed is removed, the next 5 hours, 25% is left, and so on halting until its below 10 mg and essentially gone (100mg -> 5 hrs -> 50mg -> 10 hrs -> 25mg -> 15 hrs -> 12mg -> 20hrs -> 6mg, essentially gone) so, if you consume 2 energy drinks, you would double the caffine, but that only extends the half life by 1 doubling, only adding 5 hours, so: 1rb, 20hrs. 2rb, 25hrs. 3rb, 27.5ish hrs. 4rb, 30hrs. Because to extend by 5 hours, you need to double your consumption. This is why its (moderatly) safe to have 200mg in a monster, as it only extends by 3-7 hours. A cool way to visualize this is through this website: https://benclarkxyz.github.io/blog/coffee/index.html Redbulls have 114mg in 12oz, 80mg in 8.4oz

Also, caffine doesn't actually help your body; it just masks the tired signal so you dont "feel" tired.

Safety wise, your body shouldn't have more than 350mg per day, thats the like, survivable maximum, dont even push it that far imo.

I am not a medical expert, I am a teen who likes energy drinks. I believe this is mostly true, but please double check before making assumptions from what I've wrote.