arm sore after b12 injection Common Mistakes in Injections to Avoid How to Give a B12

[1] Because intrinsic-factor-dependent uptake in the distal ileum can be absent in conditions such as autoimmune gastritis, pancreatic insufficiency, or bariatric surgery, the intramuscular or subcutaneous route bypasses gastrointestinal barriers and reliably restores serum concentrations

Most standard lyophilized research vials are commonly prepared using 2mL of bacteriostatic water unless otherwise specified directly on the product page or vial label

In sharp contrast, someone whose deficiency is purely diet-related might just need a short series of shots to replenish their stores before they can switch to high-dose oral supplements

Injection Technique: Use a sterile needle and syringe