why do i have to have vitamin b12 injections Best Injection Site: Administering B12 Shots What Are B12 Injections? And

In anemia, tissues receive less oxygen, causing fatigue and weakness

Before taking a B12 shot, tell your doctor if you: Are allergic to B12, cobalt or any multivitamin combinations Have vision issues or Lebers disease (a genetic condition that causes vision loss) Have any infections Have been diagnosed with folic acid deficiency or iron deficiency Are pregnant, breastfeeding, or planning to get pregnant Are taking any supplements, including herbal supplements Are taking any medications, such as folic acid, methotrexate, chloramphenicol, colchicine, para-aminosalicylic acid (PAS), or pyrimethamine Have liver or kidney disease Have a drinking problem Health News Heatwaves During Pregnancy Could Affect Baby's Brain Development, Study Suggests Blood Test May Predict Alzheimer's Risk Up To 10 Years Before Symptoms Begin Facing Funding Losses, States Call Out Big Businesses With Employees On Medicaid Could A Vaccine Prevent Pancreatic Cancer In Those At High Risk

This is because a lack of vitamin B12 can cause anemia, which can lead to shortness of breath

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So its important to pay attention to any symptoms -- which can grow slowly or pop up more quickly -- and to alert your doctor