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[139] [140] The work required the effort of 91 postdoctoral fellows (mostly at Harvard) and 12 PhD students (at ETH Zurich) from 19 nations
Lack of vitamin B12 in the body often leads to anemia wherein the patient feels weak and tired most of the time
For those with no known deficiencies or contraindications, vitamin B12 shots are often considered unnecessary and may not provide additional benefits
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