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When serum B12 falls in the gray zone, methylmalonic acid testing is recommended to clarify whether a functional deficiency exists
The shots are usually given in the arm and are released into the body over one to three months
The real daily recommended dosage is based on age, lifestyle, diet, pregnancy, and health conditions
The right choice depends on your goals, health history, symptoms, medications, allergies, pregnancy or breastfeeding status, and whether a B12 shot, IV therapy, wellness injection, or medical consultation is the better next step
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