Vitamin B12 Injections for Aging and Longevity InVita Wellness PDF) Patient Safety, Self injection and B12 Deficiency: a UK Cross sectional Survey Ivy Grove Surgery : Self administration of B12 injection 12 Things You Should Know About Vitamin B12 Dr. Talia Marcheggiani, ND Naturopathic Doctor Vitamin B 12 Injection, 1,000 mcg mL How to self administer subcutaneous B12 injection. 1. Withdraw proper dosage from vial into an insulin syringe 2. Clean site of injection (abdomen or other proper site) 3. Pinch the skin where