B12 vitamin Store How to inject B12 in your arm Cyanocobalamin (B12) Injection 1000 mcg mL, Multiple Dose Vial 30 mL McGuff Vitamin B12 Injection Side Effects and Safety Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief Lets do my first B12 injection together This is something Ive been nervous about for a long time, but today I finally did itand it honestly wasnt bad at all. I used the Union Medico needle guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the bodybut not all injections are the same. There are five main types. Intramuscular (IM) injections deliver