Why do I feel worse after a B12 injection: causes explained Understanding the B12 Vitamin Shot: Benefits, Risks, and Dosage Guide How Long Do B12 Injections Last: 5 Ways to Extend Effects Some periods are heavier than others, but if they become too heavy, they can they impact quality of life or even lead to anemia. When is it time to seek help and Are heavy periods holding you back? From pain relief to iron supplements, hear from Dr. Rachel Miller, pediatric gynecologist, about the different methods that can be used to treat heavy menstrual GnRH Agonists for the Treatment of Heavy Periods (PDF)