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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.
Vitamin B12, also called cobalamin, is a nutrient you need for good health. Itâs one of eight B vitamins that help the body convert the food you eat into glucose, which gives you energy.Vitamin B12 has a number of additional functions.It is needed for: 1  production of elements of DNA.itamin B12, also called cobalamin, is a nutrient you need for good health. Itâs one of eight B vitamins that help the body convert the food you eat into glucose, which gives you energy. Vitamin B12 has a number of additional functions. It is needed for: