@jimhd I think a level of 400 is fine. When I went to my neurologist a few weeks ago, she said my B12 is way too low, and repeated the blood test again. My B12 is at about 200. It was even lower the first time. She said that with someone with neuropathy, it should be at least at 400. Had my B12 problem been caught 2 years ago, when I did the first B12 blood work, I may have been really helped with B12 injections. I am taking them now, but who knows if they will help. Several of my doctors saw my low B12 and did nothing. In summary, the neurologist is aiming for my level to be at least at 400, so I think you are ok. Lori Renee