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Table 1 Age-wise requirement of vitamin B12 (microgram) in human (IOM 1998)

From: Deficiency of vitamin B12 and its relation with neurological disorders: a critical review

Age Requirement per day (μg)
0–6 months 0.4
7–12 months 0.5
1–3 years 0.9
4–8 years 1.2
9–13 1.8
14 years and older man 2.4
14 years and older women 2.4
Pregnant women 2.6
Breast feeding women 2.8