Caffeine and coffee are two different things though when one reads caffeine they often plug in the word ‘coffee’ because that’s the preferred method for most to consume our favorite drug, however being on a bodybuilding site you may be referring to caffeine pills or one of the various energy supplements offered on this site (brain candy, spike)…
Coffee and caffeine can offer health benefits in about half the population because different people fit into two categories: fast metabolizes and slow. About half of people will benefit from the antioxidants and other good things in coffee while the other half may not.
Caffeine is a drug and should be respected as such and if you feel you are overdoing it maybe you should cycle off for a month and see how that goes.
I’ve went for periods with no caffeine and periods of daily consumption. I like the “umph” factor but that quickly gets eliminated once one gets accustomed to the daily dosage
I will cycle coffee days with tea days and days with nothing at all.
100-150g (or more though that’s probably enough) is a good place to start before a workout though perhaps not before every workout.