how long do b12 injections last Does It Take for Shots to Work Fast? Feeling worse after B12 Injection:

Can B12 Shots Help with Weight Loss

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

Women with hormonal imbalances should consult healthcare providers before starting treatment

B12 injections bypass the gut, making them especially useful in these cases