Thread: Vit B12 levels
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Old Sun Nov 17, 2013, 10:32 AM
Marlene Marlene is offline
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Join Date: Oct 2006
Location: Springfield, VA
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As you know, b12 serum testing is not very accurate in assessing true B12 status. MMA & homocysteine can give you a better indication but these too are not perfect. Too bad that MMA is not available to you.

My personal opinion is that a 1200 level is not problem when supplementing with B12 in that there is no danger to high-normal or high levels. If it was high without supplementing, I would be more inclined to think there's a conversion issue.

Wait to see what the next test show. You may want to switch to another form of bio-available B12 and reduce the dosage to 3x/wk. Or just rely on a good bio-available B Complex. Your goal is to try to and maintain a minimum level of 500.

The liver houses about 5 years of B12 so it can take a while to replenish those stores. Once you've had a B12 deficiency/insufficiency, you usually need to continue with B12 supplementation on some level.
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Marlene, wife to John DX w/SAA April 2002, Stable partial remission; Treated with High Dose Cytoxan, Johns Hopkins, June 2002. Final phlebotomy 11/2016. As of July 2021 HGB 12.0, WBC 4.70/ANC 3.85, Plts 110K.
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