The time you spend with those at the firehouse the more they become your second family. If I’m having a BBQ when the weathers beautiful I make sure I go out of my way to invite everyone at my firehouse to my gathering. Whether they can make it or not is up to them but the actual act and thought of inviting them is what shows you care about them more then you do yourself at times.
The other ingredients, guarana, taurine, etc, have some effect in high doses, but unless you are drinking red bull by the gallon, the amount in a can isn’t enough to have any effect on most people. There are also times you’re going to fight and argue and seriously piss each other off. But after a few days you get over it by either talking it out or having a group sit down over some beers or coffee and trying to resolve the issue.