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All doses below come from published clinical trials, manufacturer guidelines, and established practitioner protocols as of February 2026
Once your red blood cells return to normal, you'll typically be given further injections on alternate days for the next two weeks
Do B12 Shots Restore Energy Faster Than Pills
Common side effects are typically mild and transient: Pain, redness, or swelling at the injection site (most frequent) Mild diarrhoea or gastrointestinal upset Headache or dizziness shortly after administration Itching or mild skin reactions Temporary pink/red discolouration of urine These effects usually resolve within 2448 hours without intervention
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