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Kittens with the following health issues may benefit from a B12 injection as one part of their supportive care plan: Gastrointestinal distress Malabsorption Inappetance Diarrhea Constipation Lethargy Weight loss Vomiting Anemia FIP Panleukopenia While B12 alone cannot resolve these issues, it can play a role in supporting the kittens gastrointestinal and immune health throughout their treatment and recovery
Human side-effect rates and interaction risks are not established
Vitamin shots quickly address deficiencies, with 40% of people lacking in one or more vitamins
Olasupo Odunsi, MD, Medical Director Reviewed July 22, 2026 B12 shots are marketed everywhere as a weight loss booster
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