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Other common symptoms of B12 deficiency include: Lethargy or a total lack of energy Extreme fatigue Palpitations Pale skin Feeling faint Breathlessness Weight loss and loss of appetite Your doctor may prescribe B12 injections in extreme cases that take effect right away
Where there is doubt, treatment will not be initiated until the patient has sought further advice from the recommended healthcare professional
Less supported scenario: If your B12 status is already normal, extra B12 has not been shown to consistently boost energy in otherwise healthy people
The NICE Guideline NG239 (2024) and the AAFP clinical review both support this approach
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