best way to give b12 injection

Who should not get B12 injections https://target.scene7.com/is/image/Target/GUEST_6bddad61-b133-4a98-95ab-18ddb0c51483?wid=300&hei=300&fmt=pjpeg Size:50 mg Bac water Vitamin B-12 Injection, 3,000 mcg/mL

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