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People with low B12 may experience: Persistent fatigue or low energy Weakness Brain fog, concentration issues, or memory changes Low mood or irritability Pins and needles, numbness, or nerve-type sensations Mouth ulcers or a sore tongue Paleness or shortness of breath (if anaemia is present) Some symptoms can become more serious if deficiency is prolonged, particularly neurological symptoms
used in the before mentioned case from the US, where the patient was fitted with an ICD
doi: 10.2119/2006-00079.Lee 155
The results from various in vitro and in vivo studies led to conflicting conclusions about its role in bacterial physiology, and its function as a heme transporter was previously ruled out 21,26,27
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