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These may include but are not limited to: Pain or swelling at the injection site Allergic reactions (extremely rare) If you experience any concerning side effects, contact your healthcare provider immediately

Emphasize that injections are prescribed because of a medical need (deficiency)

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Vitamin B12 supplements (either oral or injectable) are normally taken to support a healthy nervous system and are often needed in people who are deficient in vitamin B12

This metabolic function has led to widespread interest in whether B12 supplementation might support weight loss efforts

Long-term use of metformin, proton pump inhibitors or H2 blockers , which can reduce B12 absorption over years