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Below are the general guidelines provided by the National Institutes of Health: Infants (06 months) RDI in micrograms (mcg): 0.4 mcg Infants (712 months) RDI in micrograms (mcg): 0.5 mcg Children (13 years) RDI in micrograms (mcg): 0.9 mcg Children (48 years) Advertisement RDI in micrograms (mcg): 1.2 mcg Children (913 years) RDI in micrograms (mcg): 1.8 mcg Teens (1418 years) RDI in micrograms (mcg): 2.4 mcg Adults (19 years and older) RDI in micrograms (mcg): 2.4 mcg Pregnant women RDI in micrograms (mcg): 2.6 mcg Breastfeeding women RDI in micrograms (mcg): 2.8 mcg Vitamin B12 Overdose Signs and Symptoms The exact side effects of vitamin B12 in high doses aren't well-documented

How often you need B12 depends on why you are having it

Women were more prone to insufficient vitamin B12 because of blood loss from their monthly menstrual cycle

Is there a reason for you to inject

B12 shots can help improve energy levels, and sleeping patterns, help with weight loss, and even improve hair growth