The neuro issues are neurological damage - it cannot be reversed. It's either due to some sort of hereditary issue, chemical or mechanical trauma...or a pathogen.
If it's the former three, a supplement is not going to heal the damage... if it's pathogenic you can potentially stop additional damage, but giving snake oil to a snake isn't going to fix anything.
In the end, it goes without saying that it's your decision, however perhaps you can become attached to an animal that is not either sick or has a potentially life-shortening defect.