It’s a mystery to me and my neurologist couldn’t provide any promises either. He said give it time. I’m not expecting too much before 6-12 months. I suppose the cause of the smell/taste loss influences how permanent it might be. All I know is that my smell and taste haven improved significantly since I began B12 treatment for a couple of months. I have no proof it’s related, but it sure seems coincidental.

I sure hope there is improvement for you. I will retain my hope indefinitely.