both..
i have a pretty clean diet, and i intake about 180 grams a protein a day.
right now im using just some protein, glutamine, and take omega 3 pills.
i used some creatine, and i like the recovery it gives you, but hate the water retention.. so i was kind of cycling it every 3rd week i would use it.
but now i backed completely off it.
i probably dont intake as many calories as i should, for i probably burn more than i eat in a day, which is working against me building mass. but im still trying to lean out the bottom section of my abs.
i work out about 4 times a week, and only do cardio once a week, so not to burn off any muscle.