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NUTRITION 6-MIN READ UPDATED MAY 2026 Vitamin B12 After Bariatric Surgery: Why It Matters and How to Stay Above the Risk Line B12 deficiency is the most under-diagnosed long-term complication of bariatric surgery

Ingredients 1 mg cyanocobalamin, water for injections, sodium hydroxide for pH adjustment, sodium chloride, sodium dihydrogen phosphate 2 water Directions At the beginning of the treatment, 1 ampoule of 1 ml vitamin B 12 Lichtenstein (corresponding to 1000 micrograms of cyanocobalamin) is administered twice a week in the first weeks after diagnosis

Route Published human studies mainly used oral and intravenous forms

Those with diabetes, pernicious anemia and other diseases may benefit from methylcobalamin supplementation