is b12 injections as good as the pills Oral vs. B12 Injections: What Difference? The Advantages of B12 Injections
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Signs of Vitamin B12 Deficiency Vitamin B12 deficiency can develop gradually, and symptoms may range from mild to more noticeable

Post-Gastrointestinal Surgery: Procedures like gastric bypass can permanently reduce B12 absorption
[DOI] [PubMed] [Google Scholar] 139.Rashtak S., Murray J.A

B vitamins in breast milk: Relative importance of maternal status and intake, and effects on infant status and function
