Cobalamin (vitamin B12) and Folate Deficiency Province of British Columbia Subcutaneous Injection: What It Is and How to Give One A little insight to the importance of the b12 injections. My client hadn't been feeling well & had some bloods done with her GP. The results identified a severe deficiency in b12. B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Activated B12 Booster Wellness IV Infusion Therapy