Hello, regarding weight gain I need to assess your present diet intake and then I can suggest whether you need supplement or no. But for weight gain you need to eat high calorie and high protein diet. You can include 2-3 servings of milk and milk products in your diet. If you are non vegetarian then you can include lean meat like fish, chicken and eggs in your diet. Including 1-2 banana in breakfast would be helpful. For further detailed diet chart you can consult in personal.