You shouldent be drinking coffee if your on creatine. The caffine does the opposite of what
creatine is trying to do which is retain water in your muscles.
I think that you should know a little more about creatine and caffeine before you start prescribing advice. Yes, the caffeine in coffee is considered a mild diuretic, but the average lifter should be consuming enough water for this not to be an issue anyways. plus, many pre-workout creatine supplements also have a dose of caffeine that is close to that of a cup of coffee.
Seems like a marketing thing to put a diuretic into a creatine product so you would have to
consume more of the product.
Caffeine is a diuretic, meaning that it increases the excretion of water from the body in the urine. There are rumors that caffeine counteracts creatine by interfering with muscle volumizing and these are just rumors because this assumes that water retention by skeletal muscle is the source of strength. Although increasing the girth (volume) of our muscles, volumizing per se has no proven effect on strength.
Although water retention is caused by creatine in the muscle cells, its other properties are what create strength gains. it has also been speculated that caffeine leads to increased creatine absorption into skeletal muscle via its effect on extramuscular sodium