Please check with your doctor or pharmacist if you are not completely sure
Thinking clears: The foggy, hard-to-concentrate feeling often improves as levels come back up
Vitamin injections are not a substitute for medical diagnosis or treatment
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Other common side effects of B12 injections include: Diarrhea Headache Swelling (and not only at the site of the injection) If you experience any uncommon side effects, such as chest pain or hives, contact your health care provider immediately
Increased metabolism: The faster your metabolism works, the more calories you burn, even when doing nothing at all