B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 Shots Dosage for Adults: How Much, How Often, and Key Injection Guidelines Liv Hospital Vitamin B12 shots: Uses, benefits, and side effects Struggling with B12 injection frequency? Here's what you need to know If you have Pernicious Anaemia (PA) or B12 deficiency due to autoimmune gastritis, NHS guidance is clear: You should