Many teens have low iron, B12 levels years after bariatric surgery It sucks when you eat right but still end up with an iron deficiency. Or what about being a gastric bypass patient and needing vitamin B12 shots for the rest of your B12 Injections for Energy: Benefits and How It Works AZ IV Medics Sleeve Gastrectomy Gastric Sleeve Advance Surgical Perth Can You Take Weight Loss Injections After Gastric Sleeve Surgery? Fella Health Bariatric patients often need to take their Vitamin B12 in a sublingual (under the tongue) form, or injections or nasal spray form, because the surgery alters the stomach's ability to produce the