Amazon Pharmacy: Vitamin B12 (Injectable Solution) How to self administer subcutaneous B12 injection., 1. Withdraw proper dosage from vial into an insulin syringe, 2. Clean site of injection (abdomen or other proper site), 3. Pinch the skin where you Giving Your Cat a Vitamin B12 Boost. The Art of Doing Stuff Giving Your Cat a Vitamin B12 Boost. The Art of Doing Stuff
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