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These injections are often recommended if your body has trouble absorbing B12 from food or if you have a deficiency
Pre-filled pens, vials with syringes, and newer delivery formats each have nuances
The deltoid is a smaller muscle, which leaves less room for error, and reaching it on your own at the correct angle can be awkward
Single-entry and repeated-entry container considerations Sterile water labels describe a single-entry format, and some versions state that users should discard any unused amount after the first withdrawal
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