Use like 4x times a week, for a couple of weeks. It will help to gain weight with muscle not fat. In reality you don't eat much, just keep your regular food, and try to exercice. take those supplement before go to bed. Those supplements, will produce a human grown hormone. Don't use too much. and should be fine.
The fastest way to gain weight and lean muscle: Take 1200mg of l-arginine and 1200mg of L-lysine and you will see result in couple weeks. more lean muscle, strong bones, thick hair, more weight.