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2026 Update Most vitamin B12 deficiencies develop because of diet, aging, medication use, or digestive conditions

Keep vials in the original box or wrapped in foil if your refrigerator has interior lighting

The technical help of Miao-Sui Lin was greatly appreciated

Both the mucosa and the microvilli, tiny finger-like projections on the surface of the intestinal epithelial cells, receive their blood supply from the submucosal plexus

The standard escalation protocol increases your dose in stages over 16 to 20 weeks, giving your body time to adapt to each level before moving to the next

The pain wakes me up at night