How Much Can You Eat After Gastric Sleeve: Portions and Recovery Guide Bolt Pharmacy Can You Take Weight Loss Injections After Gastric Sleeve Surgery? Fella Health How Much B12 Should a Bariatric Patient Take? 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 Vitamin B12 Absorption Following Bariatric Surgery Celebrate Celebrate Vitamins 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