Side Effects and Safety When given as a shot: Vitamin C is likely safe for most people when given as a shot into the muscle by a health care provider
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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 Organized Sports Help Enhance Motor Skills in Children With Autism Money Problems Might Make Your Brain Old Before Its Time Schools Unprepared to Help Concussed Students Return to the Classroom Back Pain
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A practitioner asking should I offer MIC? in 2026 is implicitly asking why would I, when I can prescribe a GLP-1? The honest answers are narrower than the marketing, but they are real: Patients who cannot or will not take a GLP-1
For references and more information , see the sections on Visual and neurological development and Gestation and pregnancy in the Essential Fatty Acids article