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Potential Side Effects Common Side Effects Injection site reactions: Mild pain, redness, or swelling at the injection site usually resolves quickly
These include methylcobalamin which occurs in its natural form and cyanocobalamin which is a synthetic version of the same
Wellness 20 July 2025 7 min read Needle Size for a B12 Injection: A Simple Guide By Alaiyka Parvez Owner, CoLaz Aesthetics Clinic The short version For an intramuscular B12 injection, the usual choice is a 22 to 25 gauge needle, 1 to 1.5 inches long, given at 90 degrees into the deltoid
