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B12 serves many purposes in the body, such as helping make DNA and red blood cells (that carry oxygen to your organs and give you energy and help prevent fatigue)
Administered intramuscularly or intravenously, it helps support nerve health and energy metabolism
That's an extremely low effective concentration
Over a single dose, this is negligible
Lack of vitamin B12 in the body often leads to anemia wherein the patient feels weak and tired most of the time
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