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Caution is advised when supplementing vitamin B12, especially in injectable form for individuals with allergic tendencies
Ask the injector if you can downsize the needle gauge
You may have network restrictions
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On-Label vs Off-Label and Compounded Products Vitamin B12 injections are an established medical treatment for confirmed B12 deficiency and related conditions (for example, pernicious anemia and certain malabsorption states), as summarized by the NIH Office of Dietary Supplements in its Vitamin B12 fact sheet for health professionals
