Hi there.
I just wanted to share. I have been supplementing B12 for a couple years now. One was the sublingual B12 from NSP. I have been eating liver at least once a week, taking all kinds of stuff with all the B"s in them.
When I had my B12 levels checked even after fasting for 12 hours my B12 levels are through the roof! I mean over 2000! I'm like well...... I guess I'm getting enough B12. I went to my Osteopath MD, the one who's been helping me with my back, neck and TMJ and she does her exam and says "I'll bet your deficient in B12" I showed her my labs and she said "that's just your blood level at the time, it has nothing to do with what's in your cells. "

She told me to take B12 injections of a certain kind, can't remember the name at the moment.
Check out this forum at http://forums.wrongdiagnosis.com/showthread.php?t=9948 It will explain alot of what us mercury toxic people are going through with Vitamin B12 dificiency,
Sally Pacholock RN the author really seems to know her stuff, and I plan on starting B12 injections very soon.
She does say get test in B12, MMA test (Methylmalolic acid) and homocystine test.
Apparently those of us who cannot utilize B12 don't have enough intrinsic factor and problems producing enough gastrin.

Veggiemom (sorry I did not log in)