why do gastic bypass patients need b12 injections Gastric Banding Vitamin Injection: Dosage, Signs & Monitoring – Bolt Pharmacy Vitamin B12 Absorption Following Bariatric
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Methylmalonic Acid (MMA) Test : An elevated level may suggest B12 deficiency

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The presence of peripheral sensory-motor symptoms or subacute combined degeneration of the spinal cord strongly suggests the presence of a B 12 deficiency instead of folate deficiency

2002 Mar;48(3):407-9

[12] Hold the needle in your dominant hand and use the thumb and forefinger of your free hand to hold the skin taut
