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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.
The Dietary Reference Intake (DRI) of vitamin B12 varies depending on your age and your particular needs. In males and females ages 14 and over, the DRI is 2.4 micrograms (mcg) per day. That number goes up to 2.6 mcg during pregnancy and 2.8 mcg during breast-feeding.Supplementation of higher levels of vitamin B12 may be recommended for certain people over age 50 who have trouble absorbing the vitamin from foods.n males and females ages 14 and over, the DRI is 2.4 micrograms (mcg) per day. That number goes up to 2.6 mcg during pregnancy and 2.8 mcg during breast-feeding. Supplementation of higher levels of vitamin B12 may be recommended for certain people over age 50 who have trouble absorbing the vitamin from foods.