How Often Should You Get B12 Injections? A Realistic Schedule ELLEMES Medical Spa B12 Injections Specialist in Scottsdale, AZ How Often Should You Have B12 Injections? How Often Should You Get Vitamin B12 Injections? What are Vitamin B12 injections Vitamin B12 injections are used to quickly raise your B12 levels when they're low or when your body can't absorb it properly from food or tablets. What Vitamin B12 Injections: Boost Energy & Support Weight Loss