b12 injections cigna Cyanocobalamin (B12) Injection 1000 mcg/mL, Multiple Dose Vial 1 mL, 25/Tray Vitamin B12 for Injection Cyanocobalamin

End-stage renal disease or severe hepatic impairment requires caution

You can opt to take individual vitamins or choose a more comprehensive supplement that combines different focused ingredients in one product for ease and convenience

This explains why searches like can folic acid deficiency cause hair loss and can lack of folic acid cause hair loss often appear alongside vitamin B12 concerns

Severe vitamin B12 deficiency in an exclusively breastfed 5-month-old Italian infant born to a mother receiving multivitamin supplementation during pregnancy. BMC pediatrics 12.1 (2012): 1-5

For weight loss specifically, this is not a close comparison

How often should you roll up your sleeves for a B12 shot