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Front of thigh This is a popular self-injection site because of its convenience and low discomfort level
Plus, the symptoms of low B12 can be very subtle, or they may be confused for symptoms of other conditions
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They can be slightly uncomfortable and produce a tingling sensation at the injection site
Allergic reactions, such as a rash, itching, swelling, or redness, happen due to high vitamin dosage or as a response to the needle coating
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