Hi. Twice in my life I have had neuropathy symptoms (numbness arms) clincially apparent associated with low B 12. Both times were associated with protein pump inhibitor (PIP) usage for stomach issues. Both times my symptoms resolved with oral B12 supplementationl. I continue on oral B12 and try to minimize PIP usage. B12 levels are normal. I am now older and have subtle balance and lower leg proprioception issues (manageable). I walk slowly, turn slowly, do lots of walking and use a walking stick. I do wonder if any of my lower leg issues reflect the earlier B12 deficiencies, but there is no way of really knowing. Good luck to you.