Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline (2000)
Allergic reactions to b12 formulations True allergy to b12 itself remains extremely rare
These are, however, as much about the reduced caloric intake as they are about the medication directly
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[6] Vitamin B 12 deficiency is preventable with supplements, which are recommended for pregnant vegetarians and vegans, and not harmful in others
Before taking additional supplements, it's important to consult your doctor to avoid potential interactions or excessive vitamin intake