How to Give B12 Injections at Home to Yourself PA Relief Vitamin B12 Injections: Ideal Dosage & Frequency for Men's Health Practice Nursing You know where you can stick that or do you? Where to inject the deltoid and why Practice Nursing Can vitamin B12 injections be administered in the left superior deltoid three times a week or should arms be rotated? B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics