I have a 12 week old chick who has become unsteady on her feet. Her legs seem to be weak. She has had the Mareks disease vaccine. I read on here that she may be vitamin deficient and for some, poly vi sol without iron has cured these symptoms. However, I can't find it anywhere local. I can order it but want to get her help today. Any recommendations for safe alternatives to the Poly Vi Sol (without iron) drops? Thanks!