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When B12 runs low, the story is rarely about picky eating. In cats, low B12 is often tied to intestinal disease that interferes with absorption, which is why veterinarians pay attention to it in chronic digestive cases (Simpson KW, 2001)

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Reusing a syringe, even on the same vial, is a major source of contamination

Check that they use sterile equipment and have protocols in place to handle any adverse reactions

2015 Jul;59(7):1364-72

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