Well, you’re now in the normal range according to typical lab values. Every lab has a slightly different range but a 200-900 range is typical. My doc says he like his patients around 500-600.

I’m guessing here, but I suspect your neurologist gave you high-dose B12 injections or oral supplements to get your levels up. He now may likely suggest a lower dose oral supplement to help you maintain your level so your levels don’t drop.