Here are some common side effects- Common side effects Pain, redness, or swelling at the injection site Mild diarrhea or upset stomach Nausea or vomiting Dizziness Headaches Rare but serious side effects Allergic reaction, including itchiness, hives, difficulty in breathing, or swelling on the face, lips, and throat Irregular heartbeat It is essential to consult with a healthcare provider before starting vitamin B12 injections to ensure they are appropriate for your specific health needs and to receive proper administration guidance
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Vitamin B12 injections are when liquid B12 is injected into your body through a needle either under the skin or into a muscle
What it does, if you are deficient, is fix the energy and metabolic drag that low B12 causes
Both the National Institutes of Health (NIH) and the Institute of Medicine have not established an upper limit for B12 intake, even when doses exceed the daily recommended amounts by thousands of micrograms (source: National Institutes of Health)