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Signs and symptoms of vitamin B12 deficiency signs may include: Weakness or fatigue Pale skin Appetite loss Weight loss Palpitations Numbness and tingling Poor concentration Infertility Depression Memory impairment Sore mouth or tongue Disturbed sleep Frequent infections What are the side effects of a B12 shot
Long-term human safety data not established
Giving yourself B12 injections at home is easier and more convenient than having your doctor do it every time, but doing the first injection can be a little unnerving for most folks
Do not increase dose during weeks 1-2 regardless of lack of visible results
Untreated B12-related anemia can cause significant fatigue, a fast or pounding heartbeat, and other symptoms
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