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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.
Health Benefits of Vitamin B12. Health Benefits of Vitamin B12. Vitamin B12 is an essential nutrient for our red blood cells, nerve function, and is integral for DNA synthesis in our bodies' cells. It's brain food. Because the nutrient is found in animal foods, like meat, fish, dairy, and eggs, vegans are more susceptible to B12 deficiency. The Recommended Daily Allowance (RDA) is 2.4 Î¼g for both men and women. Here are 10 top food sources of Vitamin B12: