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Normal value ranges for vitamin B12 vary slightly among different laboratories and can range anywhere between 200 to 900 pg/mL. The general consensus is values less than 200 pg/mL constitute a B12 deficiency.ormal value ranges for vitamin B12 vary slightly among different laboratories and can range anywhere between 200 to 900 pg/mL. The general consensus is values less than 200 pg/mL constitute a B12 deficiency.
A B Complex that includes 250 mcg of B12 as cyanocobalamin daily should be enough for you to absorb what you need to maintain healthy levels. (As per Dr. Michael Greger's latest recommendations .). To correct a deficiency, take something in the range of 1000-2000mcg per day.he US RDA minimum for Vitamin B12 is 2.4 mcg per day for adults, and 2.8 mcg for pregnant or nursing women. More recent studies put the ideal intake at 4-7 mcg per day.