Experiencing any of these symptoms? B12 supplementation might be right for you. Some causes of low B12 are diet, alcohol use, certain diseases like Chrohn's and Celiac Disease, and Gastric Bypass surgery, MIC B12 Injections on Weight Loss, Worth it? Lavish Wellness Blog Back on the 14th November last year I posted an item about the newspaper reports of the sad case of a lady who died following an injection of Vit B12 and there CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL