Originally Posted by elmhar
To consider: EU ref ranges for normal serum B12 are higher than US standards, with 600 being the bottom cutoff for normal. Not sure what their upper level is.
Actually, the range from my lab is 120-700.
Won't comment much on the rest, since I don't know much on the subject at all. If there is such a thing as undermethylation, I probably "have it". Hmm.