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The NICE Clinical Knowledge Summary for vitamin B12 deficiency outlines specific treatment schedules: for patients without neurological symptoms, hydroxocobalamin 1 mg intramuscularly three times a week for 2 weeks

Microbiome differences were greater between the two groups switched from WD to LD (i.e., WD/LD-V and WD/LD-T) and the two diet control groups (i.e., LD/LD-V and WD/WD-V) compared to the microbiome differences observed between the lean (LD/LD-V) and obese (WD/WD-V) control groups

You should avoid eating grapefruit or drinking grapefruit juice

This depends on their Vitamin B12 needs, how severe their deficiency is, and any other health issues