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For pre-filled pens or auto-injectors, follow the manufacturer's instructions to prepare the device for injection
If you arent completely confident in your ability or feel worried, a safe choice may be to schedule an appointment to have it administered by a physician in their clinic, or to have your B12 shot administered at a pharmacy
Keep the vials refrigerated when not in use, and do not allow them to freeze
If you compete in sport, check your league rules
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