vitamin b12 injection is iv or im B Therapy — ASAP IVs B12 Injections IV Infusions -

This does not affect reconstitution, but it means the mechanism of action differs

Contact your GP if you experience: Unexpected symptoms after starting B12 supplementation, including persistent skin reactions, gastrointestinal disturbance, or mild allergic manifestations Neurological symptoms such as significant tingling, numbness, weakness, or balance problemsthese may indicate B12 deficiency paradoxically, or alternative neurological conditions requiring assessment Unexplained fatigue or malaise that develops or worsens despite supplementation Concerns about medication interactions , particularly if taking metformin, proton pump inhibitors, or other medications affecting B12 metabolism [2] [4] Seek emergency medical attention (call 999) if you develop signs of a severe allergic reaction following B12 injection, including facial swelling, difficulty breathing, or widespread urticaria

At comparable oral doses almost identical B12 concentrations were initially detected in the blood serum

Neither is 'wrong'they just serve different purposes

Some tolerate cyanocobalamin much better than the other two forms

The most common side effects are redness and swelling after treatment for rosacea or cherry angiomas