While there are many reasons why someone could feel fatigued, B12 is a part of the picture and correcting the deficiency can greatly improve energy levels
According to the Mayo Clinic, most people consume adequate amounts of B vitamins through their diet, though the elderly, particularly those with pernicious anemia, athletes, strict vegetarians, and people who consume a lot of alcohol may be deficient in the B vitamins and may require injections or oral supplementation of B vitamins or vitamin B-12, in particular
A 2.5mg dose requires 1ml
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