b12 injection is iv or im How to self-inject intramuscular vitamin - Overview Cyanocobalamin (b12) Injection 2,000 mcg/mL

Its important to note that B12 injections are most effective for patients with a documented deficiency

Breastfeeding Breastfed infants of mothers receiving biologics, immunosuppressants or combination therapies have a similar risk of infection and development milestone at 12 months to non-breastfed infants and infants unexposed to these medicines[117]

If you need to recover quickly from an illness that depleted your B12 reserves or have recently discovered you have a B12 deficiency that is impacting your quality of life, one solution is to give your body a larger dose of B12 all at once

What Are the Symptoms of Vitamin B12 Deficiency