No, unless your other chickens are sick or have a vitamin deficiency, they do not need vitamins and electrolytes (which are some of the ingredients in PC and PND.) Electrolytes given for more than a few days can give chickens diarrhea. So I would just grab up the one chicken daily or at night on the roost, and give the Poultry Cell. With neurological issues, vitamin E is also good. PC has some vitamin E, or you could give 400 IU daily of human vitamin E. A few sunflower seeds or a little tuna also is high in E.