cat vitamin b12 injection side effects B-12 in cats? Vitamin B12 Deficiency in Cats:

Mild side effects: These include redness, slight bruising, or swelling at the injection site

6 weeks after its initiation, the patient presented a sudden, extensive and monomorphic eruption of inflammatory papulo-pustules and nodules, affecting the face, and the trunk

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If the treatment is inadequate due to poor understanding of B12 metabolism, and symptoms return as a result, that's due to poor research/lack of adequate knowledge on how to treat B12 deficiency properly in PA

Its not overnight, but most people are glad they did it

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