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. 2018 Dec 20;11(1):5. doi: 10.3390/nu11010005

Table 2.

Recommended vitamin B12 supplements for maintaining already normal B12 levels in pregnant and lactating women, infants, and children.

Daily Single Dose Daily Multiple Dose Weekly Dose
Pregnant and lactating women 50 μg 1 2 μg × 3 1000 μg × 2
Children aged 6 months to 3 years 5 μg 1 μg × 2 -
Children aged 4 to 10 years 25 μg 2 μg × 2 -
Children aged 11 years and above 50 μg 2 μg × 3 1000 μg × 2

1 during pregnancy, taking this dose in two separate halves can increase B12 bioavailability.