Buy Vitamin B12 Injection at BiosenseClinic.com a Licensed Pharmacy Biosense Clinic Ivy Grove Surgery : Self administration of B12 injection How to Self Inject Vitamin B12 at Home The Sanctuary Wellness Institute MIC + B12 Injection Methionine 20 mg mL Inositol 50 mg mL Choline 50 mg mL + Methylcobalamin (B12) 30 mL Preservative Free Vial Premium Health Care Pharmacy 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