does b12 injections cause red urine Compounded Methylcobalamin (Vitamin B12) Injection, 5mg/mL Why Your Pee Turns Bright

Periodic transaminases measurements should be made during prolonged treatment with diclofenac because severe hepatotoxicity may develop without a prodrome of distinguishing symptoms

Your unique body composition plays a role in selecting the right needle

doi: 10.1038/nrd3044

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

They are not one-size-fits-all solutions, and the best starting point depends on the person's goals, health history, medications, and clinician guidance