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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

My new recommendations are updated on my Optimum Nutrition Recommendations page

Pernicious anaemia is an autoimmune condition where the body cannot absorb dietary B12 due to absent intrinsic factor

Potential side effects of B12 shots and how to manage them Like any medical treatment, B12 shots may come with potential side effects

Loading The Syringe Begin by gathering all the necessary supplies: the B12 solution, a syringe, a needle, alcohol swabs, and a sharps container