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Potential Side Effects and Safety Considerations Vitamin B12 injections are usually safe but can have side effects
Some people may only require an injection here or there to help boost mood and immune system
Older research also supports that taking 1,000 to 2,000 mcg of B12 is likely just as effective in treating deficiencies as injections
Optimal Dosage and Administration for Women The recommended starting dose for women ranges from 0.5mg to 1mg daily, administered via subcutaneous injection preferably in the morning on an empty stomach
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