injectable v-b complex or b12.... i actually get major hunger pangs after drinking agmatine and citrulline together on an empty stomach. They are both known GH production aids, but i'm not sure if this is what causes the hunger.
Higher intensity on your workouts will work. I also notice that my fish oil supplement seems to increase my appetite and they are a number of other health benefits. So it won't hurt to give them a try along with the higher intensity workouts.