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Scientific References Frequently Asked Questions How long does it take to feel better after a B12 injection
First get an injection to give your cat an immediate boost
Last reviewed: November 16, 2025 Under section 564 of the Federal Food, Drug, and Cosmetic Act (FD&C Act), the FDA Commissioner may allow unapproved medical products or unapproved uses of approved medical products to be used in an emergency to diagnose, treat, or prevent serious or life-threatening diseases or conditions caused by chemical, biological, radiological or nuclear threat agents when there are no adequate, approved, and available alternatives
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