Step 2 Stretch the skin taut over your injection site and make sure your muscle is relaxed
They are usually safe but can cause problems for some people
Still, side effects from B12 supplements are possible, especially at higher doses, and include: Headache Nausea Vomiting Fatigue Weakness Diarrhea Tingling in the hands and feet Nasal spray Vitamin B12 is also available in a nasal spray
Any initial side effects usually improve with time, and taking the injection at the same time each day, staying hydrated, and eating smaller, lighter meals to keep your blood sugar levels up can help
For patients with confirmed B12 deficiencywhether due to dietary restrictions, absorption issues, or conditions like pernicious anemiaB12 injections can be an effective way to quickly restore healthy levels