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For Severe Deficiency and Medical Conditions : Hydroxocobalamin injections are preferred, especially if you need long-lasting effects or have absorption issues

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ASeek urgent medical care if you experience difficulty breathing, swelling of the face, lips, tongue, or throat, severe rash, chest tightness, fainting, or any signs of a severe allergic reaction after receiving the injection
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The Benefits of Vitamin B12 Injections for Cats with FIP Vitamin B12 injections offer several potential benefits for cats suffering from FIP