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Those who undergo GI surgery, like removal of intestines or gastric bypass, may also have difficulty with B12 absorption (4, 5)
For larger vials you can use up to 5 mL more bac water makes microdosing easier, but insulin needles usually max out at 1 mL per injection
Important safety information Risk of introduction of bacteria under the skin during the injection It is therefore important that you wash your hands and avoid touching the sterile parts of the needle and syringe during the injection
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