are there any side effects from b12 injections Why Do I Feel Worse After My Injection? Causes & Management – Bolt Pharmacy Vitamin B12 Side Effects

Common side effects include: Injection site reactions mild pain, redness, swelling, or bruising at the injection site, typically resolving within a few days Headache usually transient and manageable with standard analgesia Nausea or dizziness particularly in the initial treatment phase Skin reactions including itching, mild rash, or acneiform eruptions Temporary urine discolouration red or orange urine is harmless and expected Diarrhoea or flushing usually mild and self-limiting In patients with severe megaloblastic anaemia, low potassium levels (hypokalaemia) may occur during initial intensive treatment, but this is uncommon in routine maintenance therapy

Yuying Luo, MD Medical Reviewer Yuying Luo, MD, is an assistant professor of medicine at Mount Sinai West and Morningside in New York City

Medical use: chronic wound healing, burn dressing

Here's an honest look at what patients report, what to realistically expect, and who benefits most