So please refresh my memory...

Are you taking the methylB12? Do you take methylfolate with it?

Some people here have found that they have the DNA mutation that interferes with proper methylation of B12 and folate.

There is a test for this that is not expensive... 23andme has it online. You might find having this test helpful in explaining things.

If you did not stop your vitamins at least 3 days before your testing, you naturally will show high levels. B12 is not toxic in any way so a high level is not a worry. It is only a consideration if really high with NO intake at all...that points to other disease entities that cause high B12. But doctors really don't understand this at all.

There can be tingling and other feelings as nerves heal. I had that with my feet when I started thyroid treatment. I had buzzing and burning feet for a year back then, before it all improved significantly. Sometimes healing is not a straight line at all. The body has priorities...and will take the B12 for the spinal cord, brain, bone marrow, muscles, etc in the order it needs. Alot is also stored in the liver.