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[PMID: 19166318]

Take a B12 supplement for targeted health needs, such as a known deficiency, a vegan/vegetarian diet, neuropathy or other nervous system issues, or the formation of red blood cells

By addressing B12 deficiencies, these injections can help you combat fatigue, sharpen your focus, and feel more energizedno matter how demanding your daily life may be

McCarty et al

But first, of course, you have to know for sure that you have it, so it has to be diagnosed

Serum cobalamin level of greater than 148 pmol/L (200 ng/l) in the presence of a strong clinical suspicion of cobalamin deficiency should be evaluated further with MMA, tHcy or HoloTC and a trial of hydroxocobalamin given to ascertain any clinical improvement