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Vitamin B12 deficiency anemia occurs when your body does not produce enough adequate red blood cells because of a lack of B12

Multiple studies report that the 776G allele is associated with lower plasma holotranscobalamin, suggesting that the arginine-containing protein either binds or delivers B12 slightly less efficiently than the proline-containing version

Bacteriostatic Water for Injection, USP description and prescribing information Pfizer Medical (2026) 3

A review found that for people without advanced neurological disorders, vitamin B12 supplements are unlikely to improve brain function