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Showing results for tags 'how high is too high?'.
DS16 is compound heterozygous MTHFR. LLMD has him supplementing with sublingual compounded methyl B12 daily (been supplementing for 2.5 yrs). He also takes 2 Thorne Methyl-Guard Plus capsules QD. His serum B12 level is >1999 (normal range is 211-946). I still don't understand the whole methylation issue - we just follow doctor's orders and supplement. I have 2 questions: 1) Could the serum B12 be elevated from too much supplementation? 2) Is the level high because he does not absorb it? Thanks in advance for any insight you may have.