Don't have all my labs back yet, but with about 6 weeks of sublingual methylcobalamin I've about doubled my B12 level. Was 261, now 536. U.S. range is roughly 100 to 800 or 900 (when I get the methylmalonic acid numbers I'll post the lot - FYI, intrinsic and parietal both negatives). Neuropathy and mood much improved, but what I found out is my level previously had been 261 for more than a year - he never mentioned it until I saw him about the neuropathy.
I'll keep you posted.