How To Self Administer Vitamin B12 Injections Invigor Medical B12 Self Injection Pen China Manufacturers & Suppliers & Factory Amazon.com: Ambimedinc Inject Ease Automatic Syringe Injector for Subcutaneous Injections or Needle Depths of 1 2" or Less Using a 1ml, 1 2ml, or 1 3ml Insulin Syringe with a Fixed Tip Needle : Health & Household 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